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

本題的完整句子應為There are several chemical factories that/which are pouring waste water into the river,本題是同時省略主語和謂語，只留下pouring,故選Ｂ，Ｃ為第三人稱的單數(shù)明顯錯誤，因為前面的主語工廠是復數(shù)。
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