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

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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