A. would do

　　B. was doing

　　C. had done

　　D. did

　　答案

　　A

　　519

　　--- I'm going to the USA.

　　--- How long

　　you

　　there?

　　A. are; staying

　　B. are; stayed

　　C. have; stayed

　　D. did; stay

　　答案

　　A

　　520.

　　Speaking with cab drivers, waitresses and even students every day _____ me feel more and confident in English.

　　A. help

　　B. has helped

　　C. have been helping D. have helped

　　答案

　　B

　　521.

　　---Tom, it’s time that you _______your own clothes.

　　---I would rather you _______that for me just like before.

　　A. washed; had done

　　B. wash; have done

　　C. washed; have done

　　D. wash; had washed

　　答案

　　A

　　522.

　　Once education is made free，many children who have dropped out of school

　　.

　　A．will come back

　　B．came back

　　C．have come back

　　D．had come back

　　It’s reported that by the end of this year the output of cars of the factory

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