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

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