问题补充：
It is in this laboratory is run by Mr. Wu the experiments are done.
A. which; that
B. that; which
C. where; that
D. that; where
答案：
(答案→)A. which; that
B. that; which
C. where; that
D. that; where
解析：考查定语从句和强调句型.第一空which引导定语从句which is run by Mr. Wu修饰先行词this laboratory.第二空that与it is构成强调句型。句意：就是在吴先生管理的这个实验室里，这个实验被做的。故A正确。
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