28. The water will be further polluted unless some measures ______.A．will be ta

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28. The water will be further polluted unless some measures ______.

A．will be taken

B．are taken

C．were taken

D．had been taken

答案

解析

略

举一反三

24. —Hi, Alice, you look tired.
—I am tired. I__________ the living room all day.

A．painted	B．had painted
C．have been painting	D．have painted

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―Look! What a mistake! Why?
―Sorry, I _________ on it.

A．don’t concentrate	B．hadn’t concentrated
C．haven’t been concentrating	D．wasn’t concentrating

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25. ―Look! What a mistake! Why?
―Sorry, I _________ on it.

A．don’t concentrate	B．hadn’t concentrated
C．haven’t been concentrating	D．wasn’t concentrating

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Our food_____out, why not go to the market and buy some?

A．runs

B．ran

C．is running

D．has been run

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24. —Mr Smith, ______ John ______ this week? A friend of his is coming to see him this afternoon.
—No. He is on holiday.

A．has; worked

B．is; working

C．did; work

D．does; work

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