单项选择题

The situation will continue to become worse ______ we take some measures.

A. when
B. because
C. if
D. unless
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单项选择题
It is said that this medicine is ______ against fever.
A. economic
B. easy
C. expensive
D. effective
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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