【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
在线课程【答案】C
【解析】
试题分析：考察情态动词。can’t 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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