单项选择题

——How ______ will you finish your homework——In half an hour.

A．soon
B．long
C．often
D．fast
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单项选择题
I don't think you've heard of him before, ______
A．don't I
B．do I
C．have you
D．haven't you
单项选择题
In some parks visitors are requested to keep ______ the grass.
A．aside
B．away
C．out
D．off
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