We_____ use mobile phones when the plane...

We_____ use mobile phones when the plane takes off

A. may not B. shouldn’t

C. needn’t D. mustn’t

D 【解析】试题分析：句意：当飞机起飞的时候我们一定不要使用手机。此处表禁止，一定不要，所以选mustn’t，A. may not 不可以，语气较轻；B. shouldn’t 不应该，表建议； C. needn’t 不必；D. mustn’t表禁止，一定不要，故选D。考点：考查情态动词的用法。

考点分析：

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