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        1. —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(shí)態(tài),句意:當(dāng)這個(gè)飛碟到達(dá)時(shí),你正在做什么?結(jié)合語境可知下文應(yīng)該用過去進(jìn)行時(shí)回答,故選B
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