单项选择题

Now this tiny housing solution is（）in urban areas in the U.S.，and Canada.

A.gain ground
B.gain ground on
C.gain ground upon

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单项选择题
The（）between rich and poor is getting bigger and bigger in some places.

A.gap
B.difference
C.variation
D.hole
单项选择题
If you need further information，please（）our office.

A.constant
B.construct
C.contact
D.contain
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