单项选择题

______ conscious of my moral obligations as a citizen.

A．I was and always will be
B．have to be and always will be
C．I had been and always will be
D．I have been and always will be
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单项选择题
You ______ Mark anything. It was none of his business.
A．needn't have told
B．needn't tell
C．mustn't have told
D．mustn't tell
单项选择题
Two boys were caught smoking in school but the principal let them ______ with a warning.
A．alone
B．off
C．in
D．out
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