单项选择题

Seldom ______ my neighbor in such good mood(心情) since I moved here.

A．I saw
B．I have seen
C．have I seen
D．Do I seen
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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
The situation will continue to become worse ______ we take some measures.
A．when
B．because
C．if
D．unless
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