It was in the lab was in the charge of Professor Smith they carried out the experiment.A.

问题补充：

It was in the lab was in the charge of Professor Smith they carried out the experiment.

A. where；that

B. which；where

C. that；where

D. which；that

答案：

A. where；that

B. which；where

C. that；where

(答案→)D. which；that

解析：本题考查强调句型及定语从句的连接词。第一空为定语从句，the lab是先行词，其在定语从句中作主语，故用which；第二空是强调句型中的that。