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I have bought three ballpoint pens,none of _____writes smoothly.

题目详情
I have bought three ballpoint pens,none of _____writes smoothly.
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答案和解析
which
两个句子用逗号隔开,一主一从;第二个是非限制性定语从句,which代替先行词three ballpoint pens,构成none of which结构,在从句中作主语.
若要填them,逗号需换成句号,改为两个并列句.