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There are several chemical factories        waste water into the river.
A.pour             B.pouring              C.pours
B

本题的完整句子应为There are several chemical factories that/which are pouring waste water into the river,本题是同时省略主语和谓语,只留下pouring,故选B,C为第三人称的单数明显错误,因为前面的主语工厂是复数。
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