Unfortunately, when we dropped in, Doctor Li ________ for Indonesia to rescue the injured there, so we only had time for a few words．A.has just leftB.was just leavingC.had just leftD.just left
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B解析考查动词时态。根据题干中so we only had time for a few words可知前句应表示李医生即将动身但还没有出发，因此选B，用进行时的形式表示即将发生的动作。