【題目】--The river used to be clean. How does it become dirty?

-- There are many factories ________ waste water into it.

A. pouring B. pour C. poured

【答案】A

【解析】

試題分析:句意:-這條河過(guò)去是干凈的。它是怎樣變得這樣臟的?--有許多工廠正在把廢水倒進(jìn)河里。固定句型There be+主語(yǔ)+doing+介詞短語(yǔ),表示在某處有某人正在做著某事。故選A。

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