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

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

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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
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