摘要：It was not until midnight they reached the camp site. A.that B.when C.while D.as 解析:句意:他们直到半夜才到达宿营地.本句考查强调结构.可以还原为:They didn't reach the camp site until midnight.强调句的结构为:it is/was+被强调成分+that+其他成分. 答案:A

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