单项选择题

The river widens considerably as it begins to turn west.

A．extends
B．stretches
C．broadens
D．bends
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单项选择题
The Constitution's vague nature has given it the flexibility to be adapted when circumstances change.
A．imprecise
B．apparent
C．clear
D．easy
单项选择题
It took us a long time to mend the house.
A．build
B．destroy
C．design
D．repair
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