________ he finished writing his paper i...

________ he finished writing his paper in such a short time surprised us all.

A．When

B．Why

C．That

D．What

C 【解析】考查主语从句的连接词。That引导主语，在句中不充当任何成分，没有任何意思，只起连接作用，不能省略。When，why在句中都有实际的意思，what在句中要充当主语，宾语，表语或者同位语。结合句意可知C正确。句意：他在如此短的时间里写完了论文让我们都很惊讶。

考点分析：

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