单项选择题

It is reported that this medicine is _______ against lung cancer.

A．economic
B．easy
C．expensive
D．effective
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单项选择题
While _______ in London, the young engineer picked up some English.
A．staying
B．stay
C．stayed
D．to stay
单项选择题
He has changed his _______ about buying a new car at least three times.
A．brain
B．head
C．mind
D．thought
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