A knowledge of several languages is essential to other majors’ study because without them one can read books only in translation

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问题 A knowledge of several languages is essential to other majors’ study because without them one can read books only in translation.

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答案代词误用,应把them改为it。

解析 此处代词指代a knowledge of several languages,其中knowledge是中心词,是单数形式,所以要把them改为it。
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