It was just at the moment __________he w

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问题 It was just at the moment __________he worked out the problem that he had long been puzzled about.A．sinceB．WhichC．becauseD．that

选项 A．since
B．Which
C．because
D．that

答案 D

解析考查强调句。本句去掉Itwas和空格处，剩下的句子经过调整语序后变成Heworked out the problem that he had long been puzzled about at the moment．仍是一个完整的句子，所以该句是强调旬。强调句的结构为“It is／was+被强调部分+that+其他成分”。第二个that引导的是定语从旬，修饰先行词problem。

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