单项选择题

We have to ask them to quit talking in order that all people present could hear us clearly.

A．decrease
B．cease
C．continue
D．keep on
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单项选择题
The conference explored the possibility of closer trade links.
A．rejected
B．investigated
C．proposed
D．postponed
单项选择题
Colleges and universities usually give diplomas or certificates to students who complete course requirements adequately.
A．responsibly
B．sufficiently
C．patiently
D．successfully
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