It was in the lab was taken charge of by Professor Harris they did the experiment.
A. which , that
B. that, where
C. whom, that
D. which, where
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(答案→)A. which , that
B. that, where
C. whom, that
D. which, where
解析：考查定语从句和强调句型。第一空关系代词Which引导定语从句，在句中做主语。第二空that与it was构成强调句型。句意：就在由Harris教授负责的那个实验室里，他们做了那个实验。故A正确。