单项选择题
Why is America called()United States?
A.a
B.the
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单项选择题
He()when the door opened and the manager came in.
A.was smiling
B.smiled
C.is smiling
D.has smiled
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单项选择题
Which river is ()shortest,the Nile,the Amazon,or the Mississippi?
A.a
B.the
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