题目内容
— How could you make such a silly mistake?
— I’m sorry.I ______ it before I handed in the paper.
A.should check B.could check
C.must have checked D.ought to have checked
D
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题目内容
— How could you make such a silly mistake?
— I’m sorry.I ______ it before I handed in the paper.
A.should check B.could check
C.must have checked D.ought to have checked
D