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
The movie star ______ with your sister, didn't he
A．used to dance
B．used to dancing
C．was used to dance
D．was used to dancing
单项选择题
The number of articles published on cancer ______ amazing.
A．is
B．are
C．have
D．have been
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