______ is often the case with children,Tom was completely better by the time the

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问题 ______ is often the case with children,Tom was completely better by the time the doctor arrived.

选项 A、It
B、As
C、What
D、Which

答案 B

解析本题考查非限定性定语从句。关系代词代替整个句子，且位于句首只能用as来引导。

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