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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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
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
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