单项选择题

I've never seen the young man ______ next to the director.

A．sits
B．sitting
C．sat
D．to sit
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If you travel in a foreign country, a tour ______ may save you a lot of trouble.
A. director
B. helper
C. guide
D. assistant
单项选择题
There are no less than 3,000 students ______ Chinese here.
A. study
B. to study
C. studied

D. studying
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