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

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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 所需填充部分是一个插在主句中间的非限定性定语从句,而主句的主语devices是复数,因而定语从句中的谓语也应和主语的复数形式一致,这就排除了C、D。另外,D项中it不是关系代词,不能引导从句;A项中that不能引导非限定性定语从句,因此只能选B。请注意:句中的as是关系代词,它既引导从句,又在从句中作主语。与which所引导的定语从句不同,as引导的非限定性定语从句可放在句首、句中和句末;而which从句只能放在主句之后。如:As was expected,he was absent again.正如所预料的,他又没来。Mary is tall,as are her sisters.玛丽长得很高,和她的姐妹们一样。He is astudent,as(which)is clear from his manner.他是个学生,这一点可以从他的举止看出来。
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