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

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—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

答案

解析

略

举一反三

The cause he had devoted himself to __________a perfect success.

A．proving

B．proved

C．was proved

D．has been proved

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—Good morning. Doctor Brown’s office.
—Hello, this is Tom Smith. Could you please tell Doctor Brown I ____? My car____ start.
A.was delayed，doesn’t B. will be delayed, won’t
C. am delayed, didn’t D would delay, mustn’t

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.— Sorry, I _______ to buy the book you need for you.
— Never mind. _______ it myself after school.

A．forget; I’d rather buy	B．forgot; I’ll buy
C．forgot; I’m going to buy	D．forget; I’d better buy

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Unfortunately, when I dropped in, Doctor Li _____ for Beijing to join in the fight again H1N1, so we only had time for a few words.

A．just left

B．has just left

C．is just leaving

D．was just leaving

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In recent years many football clubs ______ as business to make a profit.

A．have run

B．have been run

C．had been run

D．will run

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