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

分类: 作业答案 • 2021-12-20 03:39:47

问题描述：

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

答

D
一定不要的意思
abc表达的语气不够强烈