单项选择题

The classroom needs ______.

A．clean
B．B ) to clean
C．cleaning
D．being cleaned
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单项选择题
This invention is so great. ______.
A．So is it
B．So it is
C．Nor is mine
D．Nor is it
单项选择题
Some people get used ______ and it is hard for them to stop.
A．to smoke
B．to smoking
C．smoking
D．for smoking
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