单项选择题

It is said that this medicine is ______ against fever.

A．economic
B．easy
C．expensive
D．effective
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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
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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