单项选择题

Duty is an act or a course of action that people （） you to take by social customs, law or religion.

A. persuade
B. request
C. instruct
D. expect

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单项选择题
—I thought you wouldn't mind. — Well, as a matter of fact, I don't, but you ______ me first.
A. should ask



B. should have asked
C. must ask



D. must have asked
单项选择题
All of them try to use the power of the workstation ______ information in a more effective way.
A. presenting


B. presented
C. being presented

D. to present
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