单选题 There are two kinds of computers (there), both (of them) are (widely) (used) today.
  • A. there
  • B. of them
  • C. widely
  • D. used


【正确答案】 B
【答案解析】引导词用法错误，应改为of which。逗号之后的分句属于非限制性定语从句，所以应把人称代词them改为关系代词which，以引导定语从句。