Passengers

问题详情：

Passengers ________ talk to the driver while the bus is moving, because it will take his focus off the road.

【回答】

mustn't　句意：当公共汽车开动时，乘客不得与司机交谈，因为这将把他的注意力从路上转移开来。此处表示“禁止，不允许”，故用mustn't。

知识点：虚拟语气

题型：阅读填空