单项选择题

All the students were busy ___________ except Fred.

A．reading
B．to read
C．read
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单项选择题
Our classroom ___________ every day.
A．should clean
B．cleans
C．should be cleaned
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
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