什么是小儿麻痹症症:单项填空

来源：百度文库 编辑：高考问答 时间：2024/05/09 16:11:03
It was in the lab ( ) was taken charge of by Professor Black ( )
they did the experiment.
a that where b which that c when that d which where

A that 强调、where做地点状语从句.

A,it was......that.......是强调句.

a

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