单项选择题

The candles were useless in the _________ smoke, and it was many minutes before the rescuers could see.

A．intense
B．severe
C．vigorous
D．dense
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单项选择题
Its mere arrival on the scene will not _________ a revolution in education or in politics.
A．secure
B．assure
C．convince
D．ensure
单项选择题
Don't _________ this news to the public until we give you the go-ahead.
A．release
B．transfer
C．deliver
D．intimate
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