is often the case with children, Tom was better by the time the doctor arrived.A.ItB.ThatC.WhatD.As

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【题目】________ is often the case with children, Tom was better by the time the doctor arrived.

A.ItB.ThatC.WhatD.As

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【答案】D

【解析】

考查定语从句。句意：汤姆在医生赶到前已经完全没事了，这种事经常发生在孩子身上。as 引导非限制定语从句，先行词是整个句子，as在从句中作主语，意为“正如，像……一样”。故选D。