A. encouraged

　　B. has been encouraging

　　C. was encouraging

　　D. had been encouraged

　　20. The truck ran down the hill, and the driver ________， according to the local newspaper, to have been killed.

　　A. was reported

　　B. was reporting

　　C. reported

　　D. had been reported

　　21. — That must have been a long trip.

　　— Yeah, it ______ us a whole week to get there.(2011·北京)22. The Amazon valley is very important to the natural balance of the earth.Forty percent of the

　　world's oxygen ________ there

　　A. produces

　　B. has produced

　　C. is produced

　　D. has been produced

　　23. New medicines and instruments ________ every day to extend life.

　　A. develop

　　B. are being developed

　　C. are developing

　　D. have developed

　　24. The students ________ ￡50 a year to cover the cost of books and stationery.25. With the development of science, more new technology ________ to the fields of IT.

　　A. has introduced

　　B. is being introduced

　　C. is introduced

　　D. was introduced

　　26. — How about the dishes, Dear?

　　— The beef didn't taste very good. It ________ too long.

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