The fact ______ he does so in so short a period of time challenges explanation.A

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问题 The fact ______ he does so in so short a period of time challenges explanation.

选项 A、why
B、that
C、what
D、which

答案 B

解析 that这里引导的是同位语从句，说明fact的内容，that没有具体含义，这一点与which/that引导的定语从句不一样，这也是判断从句是何种类型的一个标准。

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