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，我们不能使用手机。may not 可能不；shouldn’t 不应该；needn’t 不需要，没有必要；mustn’t 禁止，不要。根据句意可知，飞机起飞时是禁止打手机的，这里的语气很强，故选D。考点：考查情态动词。

考点分析：

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