It was just at the moment __________he worked out the problem that he had lon...

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

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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