单项选择题


A．proper
B．experienced
C．hopeful
D．serious
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单项选择题
A．now and thenB．day and nightC．up and clownD．over and over
A．now and then
B．day and night
C．up and clown
D．over and over
单项选择题
A．doingB．raisingC．puttingD．producing
A．doing
B．raising
C．putting
D．producing
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