单项选择题

Did you see them ___________ in the river just now

A． to swim
B． swam
C． swimming
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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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