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B

解析 句意:大多数绝缘装置是为这种目的生产的,安装起来耗费很大。本题考查which引导的非限制性定语从句,which指代this kind。
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