这道题的解题过程是？I __work out the mat
I__workoutthemathsproblem.Lily____knowtheanswer.Let'saskherforhelp.[]A.can'tmustB.can...
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
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