单项选择题

No sooner ______ I left the library than it began to rain.

A．had
B．when
C．that
D．as
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单项选择题
It is five years ______ he left his hometown.
A．when
B．from
C．since
D．while
单项选择题
The chair ______ you are sitting is made of wood.
A．that
B．which
C．what
D．on which
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