Attention, please. All mobile phones mus_爱下问搜题

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问题选择题

Attention, please. All mobile phones must before the meeting starts. [ ]

A. turn

B. be turned off

C. be turning

答案

答案：B

选择题

I always tell my students _________ on the road because it’s really dangerous. [ ]

A. not to play

B. to play not

C. not playing

D. not play

填空题

隧道通风系统的检修，原则上安排在（）后，环调根据当天的施工配合情况优先安排配合作业。