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。