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关于并列句的问题.“Paw prints were seen in a number of places and pum

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关于并列句的问题.
“Paw prints were seen in a number of places and puma fur was found clinging to bushes.“这句话的and前为什么不加逗号?and前后都是句子啊?
关于并列句的问题.“Paw prints were seen in a number of places and pum
并列句的一种结构就是
句子 + 连词 + 句子
可以不加逗号
只有部分复合句才必须加逗号