They are smiling. There ______ much trouble solving the problem.A．couldn’t be B_刷题宝

题干

They are smiling. There ______ much trouble solving the problem.

A．couldn’t be	B．mustn’t be
C．can’t have been	D．mustn’t have been

上一题下一题 0.64难度单项选择更新时间:2016-05-27 05:05:51

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