______ is often the case is that Tom doe...

______ is often the case is that Tom doesn’t study hard and fails in passing an exam.

A．That

B．As

C．It

D．What

D 【解析】考察名词性从句。What引导主语从句What is often the case，并在句中作主语。本题容易错选B。as引导的是非限制性定语从句，指代一句话的内容在句中充当成分。

考点分析：

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