Digital PSAT Reading and Writing Practice Question 280: Answer and Explanation

Question: 280

The innate immune system ___________ of two major barriers: the skin and the natural flora (i.e., naturally occurring bacteria).

Which choice completes the text so that it conforms to the conventions of Standard English?

  • A. consist
  • B. consists
  • C. consisting
  • D. to consist

Correct Answer: B

Explanation:

B. The subject is “system,” a singular subject requiring a singular verb of “consists.” Eliminate Choice A for using a plural verb. Eliminate Choice C, which uses a gerund, ultimately leading to a sentence fragment. Choice D uses an infinitive verb, and conjugation is required for a full sentence.

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