My answer is(B) . It took me 01:12.
(A) The inconsistent use of verb tense ("were not" vs. "do so") cannot be justified. Use present tense or past tense in both places.
(B) "are not" and "do so" are consistent.
(C) See (A). In addition, "do it" is incorrect because there is no antecedent for "it".
(D) Past perfect tense of "had been doing so" is illogical.
(E) Past perfect tense of "had not had" is incorrect
...
(A) The inconsistent use of verb tense ("were not" vs. "do so") cannot be justified. Use present tense or past tense in both places.
(B) "are not" and "do so" are consistent.
(C) See (A). In addition, "do it" is incorrect because there is no antecedent for "it".
(D) Past perfect tense of "had been doing so" is illogical.
(E) Past perfect tense of "had not had" is incorrect
...
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