A 考查定语从句
句子主干部分为the lab is being reqaired
中间 从句部分where the experiments used to be done 用来修饰lab
因为lab在从句中充当地点状语,即 the experiements used to be done (in the lab)
所以用where来引导
B 和D 答案 中的that 和which 充当主语或宾语的.
A 考查定语从句
句子主干部分为the lab is being reqaired
中间 从句部分where the experiments used to be done 用来修饰lab
因为lab在从句中充当地点状语,即 the experiements used to be done (in the lab)
所以用where来引导
B 和D 答案 中的that 和which 充当主语或宾语的.