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YoujumpontoYoujumpontoabuswhileitisstillmoving.Itistoodangerous.[]A.canB.mustC.can'tD.mustn't

题目详情
You ______ jump onto
You ______ jump onto a bus while it is still moving.It is too dangerous.     [     ]
A.can          
B.must      
C.can't          
D.mustn't
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答案和解析
D