单项选择题

The company purchased several computers programmed to ______ the specific tasks required.

A．tackle
B．solve
C．assign
D．follow
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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
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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