单项选择题

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

A．begin
B．cease
C．continue
D．keep
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单项选择题
The committee comprises five persons.
A．absorbs
B．concerns
C．excludes
D．involves
单项选择题
The repair work involved modifying two of the windows.
A．clearing
B．changing
C．mending
D．painting
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