单项选择题

Professor Smith________in this famous university for tbree decades by next winter.

A．will work
B．has worked
C．has been working
D．will have workcd
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单项选择题
The president________NATO of paying too little attention to the ethnic tensions.
A．abused
B．accounted
C．accused
D．amused
单项选择题
Out of________or out of interest, people go back to school for the common goal-to improve themselves.
A．authority
B．community
C．necessity
D．property
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