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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There is no evidence ______ oil price will come down in the near future.
A. which
B. that
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单项选择题
She didn’t know ______ to express her ideas in English clearly in public.
A. which
B. why
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