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

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问题 Most electronic devices of this kind, ______ manufactured for such purposes, are tightly packed.

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

答案 B

解析定语从句。逗号之后为非限定性的定语从句，且先行词为物，只能用which或者as引导；同时，先行词为复数，所以从句的谓语动词也要用复数。

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