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试题来源：考博英语-24
【单选题】 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

参考答案：D
网考网解析：
as的用法之一：指代该句中as前面的内容，例如在本句中as指代Most insulati... 查看试题解析出处>>