题目内容

29. The company_ its sales by an average of 10% per year since its establishment in 1993.

A. increases
B. increased
C. is increasing
D. has increased

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30. The flight scheduledat 9 a. m. was delayed four hours due to the bad weather.

A. to take off
B. take off
C. taking off
D. to be taken off

21. After theythe first super computers in the 1940s, scientists and engineers began to develop ways to create networks.

A. create
B. created
C. have created
D. has created

22. Harvey finished his research paper, but he needed to check it before submitting it to the professor.

A. to type
B. typed
C. typing
D. type

23. We will inform you of the result the program is approved by the board.

A. in order that
B. as if
C. even though
D. as soon as