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
He has changed his ______ about spending so much money on the book.
A．brain
B．head
C．mind
D．thought
单项选择题
Please wait me for a moment. I will be ready
A．by the way
B．right away
C．at last
D．in that case
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