问题补充：
单选题Unfortunately,whenIdroppedin,DoctorLi_____forBeijingtojoininthefightagainSARS,soweonlyhadtimeforafewwords.A.just leftB.has just leftC.is just leavingD.was just leaving
答案：
D解析动词时态的考查。当我去看他时，他正要去北京参加抗击非典，所以只跟他说了几句话。情景是他正要去。又因为come，leave，arrive等动词的进行时表将来时，故
