单项选择题

While ______ in Paris, the old artist picked up some French.

A．staying
B．stay
C．stayed
D．to stay
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单项选择题
The situation will continue to become worse ______ we take some measures.
A．when
B．because
C．if
D．unless
单项选择题
He has changed his ______ about spending so much money on the book.
A．brain
B．head
C．mind
D．thought
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