问题补充:
—Mr. Wang is in Nanjing for a trip.
—Oh, really? When he the trip?
A. does; start
B. will; start
C. did; start
D. is; starting
答案:
A. does; start
B. will; start
(答案→)C. did; start
D. is; starting
解析:根据语境可知此句的含义是什么时候开始旅行的?描述的过去事情,故用一般过去时。因有when引导,故是特殊疑问句,其基本构成是特殊疑问词+一般疑问句?