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13 Dec 2023, 17:35
Kudos
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Bunuel
Since the fact about the mortality rates are still true, we need present tense. A,B, and D out. 'increasing mortality rate' is incorrect in E. C is the best choice.
13 Dec 2023, 20:16
Kudos
Bookmarks
Answer is C because the research has been concluded
13 Dec 2023, 20:51
Kudos
Bookmarks
A) were observed to have increased mortality rates
- This uses the past simple tense "were observed" to describe a specific past action of observing. It suggests that the observation took place at a specific point in the past.
(B) were observed to have increasing mortality rates
- This option uses the past simple tense "were observed" but uses "increasing mortality rates" which is not the usual way to express mortality rates. It implies ongoing action in the past, but it's less clear and precise than the use of "have been observed."
(C) have been observed to have increased mortality rates
- This choice uses the present perfect tense "have been observed" to connect a past action to the present. It conveys that the observation has relevance to the current situation, and the phrase "to have increased mortality rates" indicates that the increased mortality rates are still relevant.
(D) had been observed to have increased mortality rates
- This uses the past perfect tense "had been observed" which typically indicates an action completed before another past action. It might suggest that the observation happened before something else in the past, but it doesn't fit well in the context of the sentence.
(E) have been observed to have increasing mortality rates
- This uses the present perfect tense "have been observed" but uses "increasing mortality rates" which, as in option (B), is not the usual way to express mortality rates. It also implies ongoing action in the past, but it's less clear and precise than the use of "have been observed."
Option (C) is the most appropriate choice as it uses the present perfect tense, indicating a connection to the present, and it expresses the idea of increased mortality rates in a clear and direct manner.
- This uses the past simple tense "were observed" to describe a specific past action of observing. It suggests that the observation took place at a specific point in the past.
(B) were observed to have increasing mortality rates
- This option uses the past simple tense "were observed" but uses "increasing mortality rates" which is not the usual way to express mortality rates. It implies ongoing action in the past, but it's less clear and precise than the use of "have been observed."
(C) have been observed to have increased mortality rates
- This choice uses the present perfect tense "have been observed" to connect a past action to the present. It conveys that the observation has relevance to the current situation, and the phrase "to have increased mortality rates" indicates that the increased mortality rates are still relevant.
(D) had been observed to have increased mortality rates
- This uses the past perfect tense "had been observed" which typically indicates an action completed before another past action. It might suggest that the observation happened before something else in the past, but it doesn't fit well in the context of the sentence.
(E) have been observed to have increasing mortality rates
- This uses the present perfect tense "have been observed" but uses "increasing mortality rates" which, as in option (B), is not the usual way to express mortality rates. It also implies ongoing action in the past, but it's less clear and precise than the use of "have been observed."
Option (C) is the most appropriate choice as it uses the present perfect tense, indicating a connection to the present, and it expresses the idea of increased mortality rates in a clear and direct manner.
