单项选择题

He had lived in Paris for some years ______ he returned to Americ

A． afterB. untilC. beforeD. while
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单项选择题
You can see a(n) ______ of dogs in the square.
A．plenty
B．amount
C．quantity
D．number
单项选择题
People in remote areas are ______ from modern civilization.
A．cut out
B．cut off
C．cut down
D．cut in
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