______ is often the case with children, Amy was better by the time the doctor arrived.
A．It B．That C．What D．As
D
從句置于句首只有引導(dǎo)詞as 可以。as引導(dǎo)的為限制性定語從句，as在句中作主語，指代后面的整個句子。句意：就像孩子們常有的情況一樣，等大夫到了艾米的情況就好多了。
【考點定位】考查定語從句
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