【題目】 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】

試題分析:考察情態(tài)動詞。cant have been表示肯定的猜測。文意是他們很高興,在解決問題時不可能有太多問題,所以答案是C。

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