单项选择题

While ______ in China, the young man picked up some Chinese.

A．staying
B．stay
C．stayed
D．to stay
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You'd better ______ the water until it has been boiled.
A．not drunk
B．not drinking
C．not to drink
D．not drink
单项选择题
The more you follow their customs, ______ they will become to you.
A．more friendly
B．the more friendlier
C．the more friendly
D．the friendlier
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