单项选择题

A tourist is prevented from entering a country if he does not have ______ passport.

A．an operative
B．a valid
C．an efficient
D．an effective
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单项选择题
He ______ to his customers and halved the price.
A．leaked
B．drew
C．quoted
D．yielded
单项选择题
Lowbrows are quite ______ to let highbrows have their symphonies and their Russian novels.
A．content
B．contained
C．capacity
D．yearning
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