It was in the lab was taken charge of by Johnson they did the experiment.A. where；whichB.

问题补充：

It was in the lab was taken charge of by Johnson they did the experiment.

A. where；which

B. which；that

C. which；which

D. that；which

答案：

A. where；which

(答案→)B. which；that

C. which；which

D. that；which

解析：考查复杂句：第一空是定语从句先行词是the lab，定语从句中缺少主语，用that或which引导定语从句，第二空是强调句，强调的是in the lab，句意：就是在Johnson负责的实验室，他们做实验的。选B。