While I ____ for the bus,lcaught sight of my friend , Tom in the crowd.
A.waited
B.is waiting
C.was waiting
D.waits
why the answer choose C , why don't choose onthr?
tell me the reason . please use the chinese,thank you very much!
收錄日期: 2021-05-01 00:43:47
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080722000051KK01737