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2014-02-24

Most electronic devices of this kind, ______manufactured for such purposes, are tightly packed．

A．that are

B．as are

C．which is

D．it is

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参考答案

B

答案解析

B。为了此种目的而生产的电子设备大部分都是密封的。
考查定语从句。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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