Dr. Martinez is one of the researchers who _______ pioneering work in this field.
10
readingWhich choice completes the text so that it conforms to the conventions of Standard English?
A
has done
B
does
C
was doing
D
have done
Correct Answer: D
Choice D is the best answer. This question tests subject-verb agreement in relative clauses.
- Context clues: "Who" refers to "researchers" (plural).
- Meaning: The verb in the relative clause agrees with the antecedent of "who."
- Verify: "researchers who have done" correctly uses plural verb.
💡 Strategy: In "one of the [plural] who" constructions, "who" refers to the plural noun.
Choice A is incorrect because "has done" is singular. Choice B is incorrect because "does" is singular and wrong tense. Choice C is incorrect because "was doing" is singular.