单项选择题

______ happened to be no one in the building when the fire broke out.

A．It
B．There
C．This
D．That
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单项选择题
We are trying our best ______ the poor children who lost their parents.
A．helping
B．to help
C．helps
D．help
单项选择题
My parents don't ______ of my smoking.
A．approve
B．agree
C．disagree
D．think
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