单项选择题

A) concerned C) proposed
B) involved D) invited

A．concerned
B．involved
C．proposed
D．invited
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单项选择题
A) causes C) reasonsB) purposes D) aims
A．causes
B．purposes
C．reasons
D．aims
单项选择题
A) until C) ifB) before D) once
A．until
B．before
C．if
D．once
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