单项选择题

It is the fifth time you ______ late this week.

A．be
B．have been
C．will be
D．are
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单项选择题
We are studying English hard ______ our country better in the future.
A．serve
B．to serve
C．serving
D．served
单项选择题
He was very foolish to ______like that.
A．behave
B．do
C．tell
D．make
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