单项选择题

They had talked only for a few minute ______ they found they were of different opinions.

A．unless
B．while
C．before
D．once
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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
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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