问题补充：
It was in the lab was taken charge by Professor Wang they did the experiment.
A. where, that
B. that, which
C. that, where
D. which, that
答案：
A. where, that
B. that, which
C. that, where
(答案→)D. which, that
解析：考查定语从句和强调句型的融合。强调句型：it is/was被强调成分that/who其它成分；其最大的特点是去掉it is/was…that/who…句子仍然成立。本句强调的部分是in the lab which was taken charge by Professor Wang.故第二空使用that，第一空which was taken charge by Professor Wang修饰先行词the lab。定语从句中缺少主语，故使用关系代词which，避免与第二空的that重复。句意：就是在王教授负责的那个实验室里，他们做了这个实验。
