单项选择题

It is not unusual for there______generation gaps between parents and children.

A. would be
B. being
C. be
D. to be
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单项选择题
They stood still on the top of a mound, gazing out over the endless______of the grassland.
A. space
B. expanse
C. stretch
D. land
单项选择题
The housing is not______to families of low income now.
A. payable
B. approachable
C. affordable
D. reachable
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