Children()play with fife.it's dangerous A.must B.mustn't C.can't D.needn't

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Children()play with fife.it's dangerous A.must B.mustn't C.can't D.needn't

Children()play with fife.it's dangerous A.must B.mustn't C.can't D.needn't
Children()play with fife.it's dangerous A.must B.mustn't C.can't D.needn't

Children()play with fife.it's dangerous A.must B.mustn't C.can't D.needn't
C.
考察情态动词must必须 mustn't禁止 can't不能 needn't 不需要