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．flushed
B．flickered
C．flared
D．flashed
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单项选择题
All students who want to use the library borrowing services and recreational athletic, and entertainment ______must have a valid summer identification card.
A．utilities
B．facilities
C．installations
D．fittings
单项选择题
Most of______ is on American television are programs designed to appeal to people who go into the supermarkets and buy the products that are advertised on TV.
A．which
B．that
C．whatever
D．what
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