单项选择题

A) to C) with
B) about D) at

A．to
B．about
C．with
D．at
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单项选择题
A) authorities C) expertsB) directors D) managers
A．authorities
B．directors
C．experts
D．managers
单项选择题
A) connected C) involvedB) encouraged D) participated
A．connected
B．encouraged
C．involved
D．participated
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