anukrati wrote:The poll taxes enacted in the Southern states between 1889 and 1901 disenfranchised many citizens, since payment of the tax was a prerequisite for voting.
(A) and 1901 disenfranchised many citizens, since
(B) to 1910 disenfranchised many citizens, since
(C) and 1910 have disenfranchised many citizens since
(D) to 1910 has been disenfranchising many citizens because
(E) and 1910 had the effect of disenfranchising many citizens, in as much as

In this question, the correct idiom is between X and Y, hence we are left with A, C and E.

I was able to eliminate E because of "had the effect of"

But while selecting the answer I had doubts between A and C.
I selected C because the participle form of verb "disenfranchised" has the -be form of verb "have".

Can anyone explain why "be" form of verb not required.

Also can anyone provide with the explanation in what all cases we need "be" form and in what we dont need.
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theunheardmelody wrote:

anukrati wrote:The poll taxes enacted in the Southern states between 1889 and 1901 disenfranchised many citizens, since payment of the tax was a prerequisite for voting.
(A) and 1901 disenfranchised many citizens, since
(B) to 1910 disenfranchised many citizens, since
(C) and 1910 have disenfranchised many citizens since
(D) to 1910 has been disenfranchising many citizens because
(E) and 1910 had the effect of disenfranchising many citizens, in as much as

In this question, the correct idiom is between X and Y, hence we are left with A, C and E.

I was able to eliminate E because of "had the effect of"

But while selecting the answer I had doubts between A and C.
I selected C because the participle form of verb "disenfranchised" has the -be form of verb "have".

Can anyone explain why "be" form of verb not required.

Also can anyone provide with the explanation in what all cases we need "be" form and in what we dont need.
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I shall tell you how I arrived at A

I used same princeiple as you did to elimininate B,C and D.

Between A and E
E - too wordy and does not add up to make sense to the latter part of the sentence ( i mean the "in as much as"). In this questions, we are not really comparing the effect of disenfranchising to anything else. So E is not valid in my opnion.

I hope this helps.