—Whydoestheriversmellterrible?

—Why does the river smell terrible?
—Because large quantities of water__________．

A．have polluted

B．is being polluted

C．has been polluted

D．have been polluted

登录免费查看答案和解析

相关试题

We will go shopping if it____ tomorrow.

A．don't rain	B．didn't rain
C．doesn't rain	D．isn't rain

收藏答案/解析

Hurry up ! The train _____ . You know it _____ at 8:30 a.m .

A．leaves , leaves	B．is leaving ; leaves
C．leaves ; is leaving	D．is leaving ; is leaving

收藏答案/解析

They _______ a meeting when the earthquake happened.

A．had	B．would have
C．were having	D．are having

收藏答案/解析

The farmers _____ a lot _____ the flood because it rained heavily .

A．suffered; from	B．suffered; for
C．will suffer for	D．suffer; to

收藏答案/解析

Whenever you are in trouble, you may ________ Mike. He is helpful.

A．turn to	B．turn up
C．turn on	D．turn down

收藏答案/解析