The river ________ (become) dirty since the paper factory wa
The river ________ (become) dirty since the paper factory wa
the river becomes ()because the paper factory pours waste wa
The river and air __(pollute)since the paper factory opened
That paper factory are pouring d__ water into the river
The river has become very dirty和the river has been very dirt
He saw a paper factory ——waste water ——the river . A、pouring
Factory and c____ make the air dirty
It is wrong of them to ________ dirty water into the river o
这道题:The man_____in the factory since 2008.
The river became dirty last year.The river has became dirty
They have ______ since the factory opened.
Three fifths of the water in the river _dirty.