单项选择题

You ______ Donna to tell her the news yesterday. I have told her on the phone.

A．needn't write
B．mustn't write
C．needn't have written
D．mustn't have written
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单项选择题
The social security system is designed to ______ a basic standard of living for people in financial need.
A．secure
B．keep
C．preserve
D．maintain
单项选择题
The whole country was ______ to see that the president would return to office after the turmoil.
A．released
B．relaxed
C．relieved
D．relied
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