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
There is a nice-looking car there. Peter wonders ______.
A. it belongs to who
B. whom does it belong to
C. whom it belongs to
D. who does it belong to
单项选择题
This book is designed for the learners ______ native languages are not English.
A. whose
B. which
C. who
D. what
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