单项选择题

It is important to provide an environment（）people are encouraged to make suggestions at all levels of the company.

A. from which
B. on which
C. in which
D. for which

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单项选择题
Scientists should be kept（）of the latest achievements in their research areas.

A. inform
B. informing
C. informed
D. to inform
单项选择题
The scientists wanted to keep people（）about the breakthrough in their experiment.

A. inform
B. informed
C. informing
D. to inform
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