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I forgot to ring up Mr.Wang yesterday,so I _______ today.(2

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I forgot to ring up Mr.Wang yesterday,so I _______ today.(2 分)
A.can do it
B.must do it
C.had to do it
D.must have to do it
I forgot to ring up Mr.Wang yesterday,so I _______ today.(2
B
A. can do it 语境不表示"能"
B. must do it 合乎语境表示"必须去做"
C. had to do it 时态问题,today——应用现在时
D. must have to do it 两个"必须"不能同时使用