Children should _________waste water.
A. tell not to
B. be told don’
C. be told to don’
D. be told not to
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（）
--Mike, you’ ve got so many beautiful stamps.--Yeah. I _________ collect stamps when I was in primary school.
A. was used to
B. used to
C. am used to
D. used
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