单项选择题

The tragedy of the Challenger ______ an ongoing controversy on all aspects of America's space program.

A．arose
B．ignited
C．resulted
D．started
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单项选择题
We refuse ______ that there are insufficient funds in the great vaults of this nation.
A．to believe
B．to be believed
C．believing
D．have believed
单项选择题
Above the trees are the hills, ______ magnificence the river faithfully reflects on the surface.
A．where
B．of whose
C．whose
D．which
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