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
I got a new battery for my recorder only last week, but it seems to have ______ already.
A．worn out
B．run down
C．knocked off
D．gone off
单项选择题
The ______ friend was exposed in the end to be a hidden rival who had been plotting against the company's marketing in Hong Kong.
A．professed
B．announced
C．exclaimed
D．declared
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