单项选择题

The tourist is prevented from entering a country if he does not have a (n) passport.

A．operative
B．effective
C．valid
D．efficient
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单项选择题
No sooner had they sat down ______ they found it was time to leave.
A．when
B．then
C．as
D．than
单项选择题
Hugh's girl friend expects him to stop work and do things for her ______.
A．on demand
B．on need
C．in demand
D．in need
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