单项选择题

The classroom needs __________.

A．clean
B．to clean
C．to be cleaned
D．being cleaned
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单项选择题
No one, except his two best friends, __________ where he is.
A．know
B．knows
C．to know
D．knowing
单项选择题
Only in this way __________ catch up with your brothers.
A．do you can
B．can you
C．you can
D．you do can
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