—Whydoesthelakesmellterrible?b

—Why does the lake smell terrible ?
--because large quantities of water ____.

A．have polluted

B．is being polluted

C．has been polluted

D．have been polluted

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相关试题

To make members of a team perform better, the trainer first of all has to know their ________ and weaknesses.

A．strengths

B．benefits

C．techniques

D．values

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—Could I borrow your dictionary?
—Yes, of course you ________.

A．might

B．will

C．can

D．could

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—The room is so dirty.________ we clean it?
—Of course.

A．Will

B．Shall

C．Would

D．Do

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—Next week we’ll have the final English exam.
—Yes. Then, every minute must be made full use ________ English.

A．of studying

B．to study

C．of being studied

D．of to study

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—Can I help you, sir?
—Yes. I bought this radio here yesterday, but it ________.

A．didn’t work

B．won’t work

C．don’t work

D．doesn’t work

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