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【题目】 They are smiling. There ______ much trouble solving the problem.

A. couldn’t beB. mustn’t be

C. can’t have beenD. mustn’t have been

【答案】C

【解析】

试题分析:考察情态动词。cant have been表示肯定的猜测。文意是他们很高兴,在解决问题时不可能有太多问题,所以答案是C。

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