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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The situation will continue to become worse ______ we take some measures.
A. when
B. because
C. if
D. unless
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It is said that this medicine is ______ against fever.
A. economic
B. easy
C. expensive
D. effective
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