DmitryFarber wrote:
Actually, the phrase "in the 1950's" is an adverbial modifier here. As in the other four answer choices, it modifies "questioned." (Note that the construction "in (time period)" will generally be adverbial, while "of (time period)" is a noun modifier.)
The tense problem in C is a serious one. We just can't say "As did Skinner, Watson had conducted . . . " Think of "did" almost like a pronoun--except for verbs.
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