单项选择题
Most insulation devices of this kind, ______ manufactured for such purposes, are extremely expensive to install.
A．that are
B．which is
C．those are
D．as are
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单项选择题
He used to play badminton with you, ______.
A．didn't he
B．used he
C．did he
D．gone off
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单项选择题
This state research program is made up of two funds, ______ could last for two years.
A．the larger one
B．the larger of which
C．the largest one
D．the largest of which
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