单项选择题

I know something about Xi’an. I __________ there many times.

A． have gone
B． went
C． have been
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—__________ I watch TV tonight.'—Yes. But you __________ finish your homework first.
A． May... may
B． Must... may
C． May... must
单项选择题
There are __________ people in the park.
A． six hundreds
B． six hundreds of
C． hundreds of
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