单项选择题

Don't throw the papers into the rubbish. They ______ be valuable for others.

A．may
B．can
C．must
D．might
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单项选择题
I don't know when he ______ back. When he comes back, please let me know.
A．would come
B．comes
C．will come
D．is coming
单项选择题
Hangzhou is known ______ Chinese ______ her beauty ______ a famous touring city.
A．as
B．for
C．on
D．to
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