单项选择题

I had been puzzled over the problem for over an hour without any result when all at once the solution _________ across my mind.

A．flickered
B．flared
C．flushed
D．flashed
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单项选择题
John is a man of few words, but he made such a(n) _________ speech at the meeting yesterday that everybody was impressed.
A．magnificent
B．promising
C．eloquent
D．notable
单项选择题
Attempts to restrict parking in the city center have further _________ the problem of traffic congestion, and sometimes the traffic comes to a complete stop in some places.
A．degraded
B．aggravated
C．amplified
D．diffused
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