单项选择题

A) while C) because
B) however D) but

A．while
B．however
C．because
D．but
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单项选择题
A) representative C) behalf B) benefit D) interest
A．benefit
B．representative C) behalf
C．interest
单项选择题
A) service C) help B) assistance D) benefit
A．service
B．assistance
C．help
D．benefit
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