Many large rivers were straightened and their beds deepened.
后面那一句是不是省略了were,完整是说成their beds were deepened吗?
如果是省略were,那为什么可以省略呢?
并列句的后一个分句在书面语中可以省略和前一个分句中相同的部分。读者可以根据前一分句还原省略的内容。
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