Mr. Smith has promised that all of us will pass the exam, so it ____ so difficul

题干

Mr. Smith has promised that all of us will pass the exam, so it ____ so difficult as you imagine.

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

上一题下一题 0.4难度单项选择更新时间:2012-10-13 11:13:06

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