问题
选择题
一_______ will the foreign students be back from Tibet?
一In two weeks．I think．
A. How soon B. How far C. How long
答案
答案：A
疑问词辨析. How soon多久;How far多远;How long多长;
根据答语中In two weeks两周后,可知答案为A,这些外国学生从西藏返回需要多久?