题目
A.a problem
B.something that happen
C.a special skill
第4题
A.public event MsgEvent
B.public event MsgHandler MsgEvent
C.public event MsgEvent(string msg)
D.public event delegate MsgEvent
第8题
A.public event MsgEvent
B.public event MsgHandler MsgEvent
C.public event MsgEvent(string msg)
D.public event delegate MsgEvent
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