单项选择题

The question is worth () again.

A. discussing
B. to discuss
C. discussed
D. discuss

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单项选择题
If you don’t () smoking you will never get better.

A. prevent from
B. give up
C. forgive
D. keep away
单项选择题
Training is provided, so no () experience is required for the job.

A. previous
B. principal
C. following
D. precious
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