The river and air __(pollute)since the paper factory opened
The river and air __(pollute)since the paper factory opened
The river ________ (become) dirty since the paper factory wa
They have ______ since the factory opened.
the air【】【pollute】
Mr.Smith has been here since the factory opened为
Mrs.Green ______ here since the factory opened.
the river becomes ()because the paper factory pours waste wa
Factories,cars and trucks are _______ the air.(pollute)
That paper factory are pouring d__ water into the river
Factory and c____ make the air dirty
but we now have less trees ,and the air and water is pollute
we have worked there since the factory opened.为什么不是had