单项选择题

It is essential that these application forms back as early as possible.

A．must be sent


B．will be sent
C．are sent



D．be sent
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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
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
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