题目内容

Children should _________waste water.

A. tell not to
B. be told don’
C. be told to don’
D. be told not to

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邮政通信的全部传递过程,通常由两个或两个以上的邮政通信企业协同作业才能完成。为了实现协同作业,必须制定统一的作业流程和操作规范,并且统一计划、统一指挥调度()

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A. was used to
B. used to
C. am used to
D. used

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