问题补充：
---Could you tell us ?
---In two days.
A. how long will he come back
B. how long he will come back
C. how soon will he come back
D. how soon he will come back
答案：
A. how long will he come back
B. how long he will come back
C. how soon will he come back
(答案→)D. how soon he will come back
解析：
试题分析:根据答语in two days可知询问的是多久以后，故用how soon来提问，又因宾语从句要用陈述句语序，故选D。
