There are two kinds of computers (there), both (of them) are (widely) (used) tod

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问题 There are two kinds of computers (there), both (of them) are (widely) (used) today.

选项 A、there
B、of them
C、widely
D、used

答案 B

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。

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[originaltext]Inmanybusinesses,computershavelargelyreplacedpaperwork