单项选择题

At the later stage of development, there ______ new problems which first seemed insoluble.

A．rose
B．arose
C．resulted
D．happened
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单项选择题
The local government has to ______ the tax scheme because of the strong opposition.
A．abandon
B．resign
C．release
D．restrict
单项选择题
The congress, by a two-third vote in each house, may ______ an amendment to the Constitution.
A．start
B．initiate
C．begin
D．propose
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