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
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单项选择题
My parents don't ______ of my smoking.
A．approve
B．agree
C．disagree
D．think
单项选择题
We are all taking medicine ______ the flu.
A．for
B．on
C．against
D．of
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