单项选择题
Was that a proper topic ______ on such a formal occasion
A．to talk about
B．having talked about
C．talked about
D．being talked about
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单项选择题
In this area open-mining has ______ the natural scenery.
A．ruined
B．created
C．added
D．developed
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单项选择题
The phrase white elephant is used to describe something that the owner ______.
A．loves to keep
B．bought cheap
C．wants to get rid of
D．wants to sell
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