Most insulation devices of this kind, ______ manufactured for such purposes, are

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问题 Most insulation devices of this kind, ______ manufactured for such purposes, are extremely expensive to install.

选项 A、that are
B、which is
C、those are
D、as are

答案 D

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 insulation devices of this kind。

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Mostinsulationdevicesofthiskind,______manufacturedforsuchpurposes,are