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
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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
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
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