Question

【题目】Experiments of this kind _______ in both the U.S. and Europe well before the Second World War.（2011北京卷21）

A. have conducted

B. have been conducted

C. had conducted

D. had been conducted

Answer 1

【答案】 D

【解析】 考查动词时态和语态，句意为“就在二战爆发前，美国和欧洲都进行过这种实验。”首先考虑语态，主语experiment与conduct构成动宾关系，谓语使用被动形式。题干中出现the second war是过去的时间点，before the second war是过去的过去，因此使用过去完成时。选D。