[题目]Experiments of this kind in both the U.S. and Europe well before the Second World War.A. have conducted B. have been conductedC. had conducted D. had been conducted 题目和参考答案——青夏教育精英家教网—

【题目】Experiments of this kind____ in both the U.S. and Europe well before the Second World War.

A. have conducted B. have been conducted

C. had conducted D. had been conducted

【答案】D

【解析】试题分析：考查时态。句意：在二战以前，这种实验已经在美国和欧洲进行了无数次。experiments与conduct是动宾关系，应该用被动，排除A、C；根据“before the Second World Wall”可知，应该用过去完成时，故选D。

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