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。
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