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
Nobody but Jane ______ the secret.
A．know



B．knows
C．have known


D．is known
单项选择题
Her sister （） a rich man. They （）for twenty years.

A. married with; have married
B. married to; have married
C. married; have been married
D. had married; have been married
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