It was in the lab was in the charge of Professor Smith they carried out the experiment.A.

It was in the lab was in the charge of Professor Smith they carried out the experiment.
A. where；that
B. which；where
C. that；where
D. which；that

A. where；thatB. which；whereC. that；where (答案→)D. which；that解析：句意:就是在史密斯教授负责的实验室里，他们进行了这个实验。第一空是which引导的定语从句，它在从句中做主语，先行词是lab，第二空是强调句型中的that，被强调的部分是地点状语in the lab，判断强调句型的方法是把It was that去掉整个句子不缺成分，是成立的。故选D。

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