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# Since 1990 there are three times as many cases of West Nile virus diag

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Math Expert
Joined: 02 Sep 2009
Posts: 52902
Since 1990 there are three times as many cases of West Nile virus diag  [#permalink]

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18 Oct 2018, 05:07
00:00

Difficulty:

5% (low)

Question Stats:

89% (01:05) correct 11% (01:01) wrong based on 83 sessions

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Since 1990 there are three times as many cases of West Nile virus diagnosed, and there has been no progress in the search for a vaccine.

(A) Since 1990 there are three times as many cases of West Nile virus diagnosed

(B) The diagnosis of cases of West Nile virus was only one-third in 1990

(C) The diagnosis of cases of West Nile virus has increased three times from 1990 on

(D) Tripling since 1990, there are now three times as many cases of West Nile virus diagnosed

(E) The number of diagnoses of West Nile virus has tripled since 1990

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Re: Since 1990 there are three times as many cases of West Nile virus diag  [#permalink]

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18 Oct 2018, 05:32
Since 1990 there are three times as many cases of West Nile virus diagnosed, and there has been no progress in the search for a vaccine.

(A) Since 1990 there are three times as many cases of West Nile virus diagnosed : With since ,here, present perfect tense should be used.The non underlined part after and is also in present perfect tense.

(B) The diagnosis of cases of West Nile virus was only one-third in 1990: Meaning error. Original sentence conveys increase in number of instances of diagnosis.

(C) The diagnosis of cases of West Nile virus has increased three times from 1990 on : Same as in B.

(D) Tripling since 1990, there are now three times as many cases of West Nile virus diagnosed : After the modifier, doer of the action tripling should be mentioned.

(E) The number of diagnoses of West Nile virus has tripled since 1990 : CORRECT
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Re: Since 1990 there are three times as many cases of West Nile virus diag  [#permalink]

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18 Oct 2018, 08:00
I also go with E.

With since you use present perfect tense

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Posts: 52902
Re: Since 1990 there are three times as many cases of West Nile virus diag  [#permalink]

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21 Oct 2018, 22:57
Bunuel wrote:
Since 1990 there are three times as many cases of West Nile virus diagnosed, and there has been no progress in the search for a vaccine.

(A) Since 1990 there are three times as many cases of West Nile virus diagnosed

(B) The diagnosis of cases of West Nile virus was only one-third in 1990

(C) The diagnosis of cases of West Nile virus has increased three times from 1990 on

(D) Tripling since 1990, there are now three times as many cases of West Nile virus diagnosed

(E) The number of diagnoses of West Nile virus has tripled since 1990

MANHATTAN REVIEW OFFICIAL EXPLANATION:

Choice A uses ‘since’ and the present tense. The present perfect is necessary. For example, ‘since 1990 there have been many cases...’. The correct subject of the sentence is ‘the number of diagnoses’, not ‘the diagnosis of cases’. Eliminate B and C. ‘Tripling’ in D is incorrect. Again the present perfect would have to be used to describe an action which started in the past and has continued up to the present. Choice E, the correct answer, shows this use of the present perfect. ‘The number...has tripled.’
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Re: Since 1990 there are three times as many cases of West Nile virus diag   [#permalink] 21 Oct 2018, 22:57
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