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题目内容
（郑州航空工业管理学院-大学英语）
It is important to provide an environment ________ people are encouraged to make suggestions at all levels of the company.
（4.0分）
4.0 分
A、
on which
B、
in which
C、
for which
D、
from which
（4.0分）
4.0 分
A、
on which
B、
in which
C、
for which
D、
from which
参考答案