- 试题详情及答案解析
- 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 |
- 答案：C
- 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