Re: Why cheddar cheese should inhibit tooth decay is unclear, but Dr. Bowe
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03 Jul 2020, 03:29
OFFICIAL EXPLANATION:
Rhetorical Construction; Diction
The sentence considers some possible mechanisms by which cheddar cheese might inhibit tooth decay. The underlined portion of the given sentence may express a certain skepticism, signaled by the use of why … should, as to whether cheddar cheese does, in fact, inhibit tooth decay, and the rest of the sentence attributes to Dr. Bowen a speculation as to how this might occur. The expression why … decay is a noun clause and the subject of the verb is.
A Correct. As explained above, this version of the sentence is clear and grammatically in order.
B This answer choice is incoherent. Because it is nonsensical to say that cheddar cheese is not clear, cheddar cheese cannot be taken as the subject of the verb is; the phrase cheddar cheese and is therefore best viewed as a fragment that does not fit grammatically in the context.
C This version appears intended to indicate that no clear mechanism by which cheddar cheese inhibits, or could inhibit, tooth decay has been described. Because the concern about a mechanism would presuppose that cheddar cheese does, or could, inhibit tooth decay, the use of should to indicate doubt as to whether this is so does not fit well in context.
D The intended thought in this answer choice may be something like the following: it is unclear that cheddar cheese inhibits tooth decay, and how [it would do so]. But this is not correctly expressed. The verb is seems to have two subjects, the that-clause and the implicit how-clause, so the verb form should be the plural are.
E This answer choice is unnecessarily awkward and wordy, with the use of there is and the unnecessary use of the noun inhibition instead of a form of the verb inhibit.
The correct answer is A.