I ran across a car crash in Hong Kong, and ________, both sides just politely exchanged the telephone numbers and cards, a surprise to me.
A.similarly
B.unexpectedly
C.willingly
D.disappointedly
网友回答
B解析考查副词辨析。根据句意，发生了交通事故后，双方礼貌地交换名片，电话号码，这是出乎意料的事情。故用B。