问题
选择题
I __work out the maths problem.Lily____know the answer.Let's ask her for help.[ ]
A.can't must
B.can't may
C.may not , has to
D.have to ,can
答案
答案：A
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I __work out the maths problem.Lily____know the answer.Let's ask her for help.[ ]
A.can't must
B.can't may
C.may not , has to
D.have to ,can
答案：A