—What were you doing when the UFO arrived?— I         with my dog on the street.
A．walked B．was walkingC．is walkingD．have walked
B
考察時態(tài)，句意：當這個飛碟到達時，你正在做什么？結(jié)合語境可知下文應(yīng)該用過去進行時回答，故選B
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