单项选择题

Our classroom ___________ every day.

A．should clean
B．cleans
C．should be cleaned
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单项选择题
—How far is it from your house to the factory
A．Two thousands kilometres
B．Two thousand kilometres
C．Thousand of kilometres
单项选择题
The old teacher ________ in this school since 1962.
A．worked
B．works
C．has worked
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