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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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
Jerry seldom came to the laboratory, ______ he
A．did he
B．didn't he
C．does him
D．doesn't he
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