单项选择题

If your wages are very small, they'll be free () income tax.

A．with
B．about
C．to
D．of

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单项选择题
That teacher is very good () children.

A．over
B．at
C．on
D．with
单项选择题
Look () ! There's a car coming.

A．up
B．out
C．back
D．over
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