I have bought three ballpoint pens,none of -----writes smoot

学习时间:2026-10-14 00:00:57 阅读：7216

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

独特的山水

2026-10-14 00:00:57

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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。