单项选择题

It is important to provide an environment ______ people are encouraged to make suggestions at all lev- els of the company.

A．from which
B．on which
C．in which
D．for which
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单项选择题
By the time you come to see me next month, I ______ my term paper.
A．have completed
B．complete
C．am completing
D．will have completed
单项选择题
The sales manager had his secretary ______ a press conference for their new products.
A．arrange
B．to arrange
C．have arranged
D．arranged
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