题目内容

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

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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

24. Having your smartphone or computer_ may cause a lot of trouble to you.

A. damaged
B. damage
C. damaging
D. to damage

25. Anyoneworks in the retail business needs to be good at calculating and communicating.

A. which
B. whom
C. who
D. what