单项选择题

The children lost their way in the forest, and ______ made matters worse was that night began to fall.

A．what
B．it
C．which
D．that
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单项选择题
You will hardly believe it, but this is the fourth time tonight someone ______ me.
A．should telephone
B．telephoned
C．has telephoned
D．telephones
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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