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Quote:
Contrary to popular belief, not every snake with reddish or brownish scales is a copperhead; a wide variety of perfectly harmless snakes that are frequently mistaken for copperheads.

A. copperhead; a wide variety of perfectly harmless snakes that are frequently mistaken

B. copperhead; a wide variety of perfectly harmless snakes that are frequently mistook

C. copperhead; there is a wide variety of perfectly harmless snakes that people frequently
mistook

D. copperhead; there is a wide variety of perfectly harmless snakes that people frequently
mistake

E. copperhead; a wide variety of perfectly harmless snakes that people frequently mistake

Choices A, B and E can be Eliminated because the fragment after semicolon cannot stand alone.
Now, we are left with C and D.
Between them, clearly the one with mistake for is the correct option.
So, D is the answer.
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dominicraj
Contrary to popular belief, not every snake with reddish or brownish scales is a copperhead; a wide variety of perfectly harmless snakes that are frequently mistaken for copperheads.

A. copperhead; a wide variety of perfectly harmless snakes that are frequently mistaken

B. copperhead; a wide variety of perfectly harmless snakes that are frequently mistook

C. copperhead; there is a wide variety of perfectly harmless snakes that people frequently
mistook

D. copperhead; there is a wide variety of perfectly harmless snakes that people frequently
mistake

E. copperhead; a wide variety of perfectly harmless snakes that people frequently mistake


I was between C and D, but in C) copperhead; there is a wide variety of perfectly harmless snakes that people frequently
mistook
, doesn't it modify snakes ? If I remember correctly we can use -ed and past tense in a modifier. I know because of tense of the previous cluase present is more suitable , but I want to know why we can't use modifer in past because GMAT uses it very frequently like " house that is located on the other side of the island:

Looking forward to any enlightenment and discussion.

Thanks
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I was between C and D, but in C) copperhead; there is a wide variety of perfectly harmless snakes that people frequently
mistook , doesn't it modify snakes ? If I remember correctly we can use -ed and past tense in a modifier. I know because of tense of the previous cluase present is more suitable , but I want to know why we can't use modifier in past because GMAT uses it very frequently like " house that is located on the other side of the island:



Thanks
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Resad95
I was between C and D, but in C) copperhead; there is a wide variety of perfectly harmless snakes that people frequently
mistook , doesn't it modify snakes ? If I remember correctly we can use -ed and past tense in a modifier. I know because of tense of the previous cluase present is more suitable , but I want to know why we can't use modifier in past because GMAT uses it very frequently like " house that is located on the other side of the island:



Thanks

The modifier of "snakes" is "that people frequently mistake / mistook for copperheads."
Use of present tense and past tense are both grammatically alright. However option C (past tense) may imply that people no longer have the misconception. This meaning is not intended.

(Note: The example you have given "... is located...." is also in present tense, not past as you mentioned).
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B&C can clearly be omitted due to tense agreement (mistook)
A&E are easy to identify for fallacy; sentences after semicolon should hold as a separate sentence.
D left- which also agrees with both correcting the errors in the rest two options.

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