Older computers are not able to run these new programs,________causes them to perform more slowly.

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问题 Older computers are not able to run these new programs,________causes them to perform more slowly.

选项 A、that
B、which
C、what
D、where

答案B

解析 本题考查非限制性定语从句中关系代词的用法。分析句子结构可知,空格处的关系代词应指代前面的“旧电脑无法运行这些新程序”这件事,which引导非限制性定语从句时,可修饰整个主句,由此确定本题答案为B)。that引导定语从句时,可代指人或物,但仅用于引导限制性定语从句;what不能引导定语从句;where虽可引导非限制性定语从句,但先行词应与地点相关。以上都不符合句子结构要求,均可以排除。
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