we____ use mobile phone when the plane take offA.may not B.shouldn't C.needn't D.mustn't

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we____ use mobile phone when the plane take offA.may not B.shouldn't C.needn't D.mustn't
we____ use mobile phone when the plane take off
A.may not B.shouldn't C.needn't D.mustn't

we____ use mobile phone when the plane take offA.may not B.shouldn't C.needn't D.mustn't
D
一定不要的意思
abc表达的语气不够强烈