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

题目内容

Experiments of this kind ________ in both the U.S. and Europe long before the Second World War.

A. conducted B. was conducted

C. had been conducted D. had conducted

【解析】

试题分析：考查时态。句意：早在二战之前，这类实验就已经在美国和欧洲进行过(很多次)了。experiments与conduct是动宾关系，即实验被(研究人员)做，应该用被动语态，排除A、D；before与完成时连用，根据“long before the Second World War”可知，实验发生在过去的过去，应该用过去完成时，故选C。

考点：考查时态

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