Official Solution:Citing the fact that one of their more challenging hurdles has been the recent unexpected failure of the gene therapy treatment, the cancer therapy research team applied for additional government funding to further research the treatment.A. their more challenging hurdles has been the recent
B. their more challenging hurdles has been the recently
C. its more challenging hurdles is the recent
D. its more challenging hurdles had been the recent
E. its more challenging hurdles had been the recently
The Question tests on : Pronoun - its vs their ; Verb - is vs has been and Adjective recent vs Adverb recently There are two grammatical mistakes in Choice A, the Original sentence, ONE concerning the possessive pronoun
their and OTHER concerning the tense of the verb phrase
has been.
The antecedent of
their is the
cancer therapy research team, which is a collective noun that is grammatically singular even though it refers to a group of people. Thus, this pronoun should be
its rather than
their. This narrows our answer choices down to C, D, and E.
Answer choice C is different from D and E in its use of the verb
is rather than
had been. The past perfect tense form is used to describe an action that was completed before another past event took place. The treatment failed
before the cancer therapy research team requested more funds, so both the original
has been and the present tense verb
is in choice C are incorrect.
Choice D retains the adjective
recent, while choice E substitutes the adverb
recently. Because this word describes the noun
failure,
recent is the correct option.
The correct answer choice is
D, which fixes both the pronoun number error and the verb tense error and keeps the adjective
recent.
Answer: D