问题补充：
It was in the lab was taken charge of by our teacher they did the experiment.
A. which; that
B. where; which
C. which; where
D. that; where
答案：
(答案→)A. which; that
B. where; which
C. which; where
D. that; where
解析：强调句和定语从句，第一空填which引导定语从句，先行词是which，定语从句中缺少宾语，第二空填that，是强调句，强调的是in the lab，句意是：就是在我们老师负责的实验室他们做了实验。选A.
