单项选择题

The new policy may have protected the new city from being polluted as well as the life of its residents ______.

A．affected
B．affecting
C．is affected
D．having affected
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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
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
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