--- Do you know _____?
--- Next Sunday.
A. what they will do B. what will they do
C. when will they come D. when they will come
--- Do you know _____?
--- Next Sunday.
A. what they will do B. what will they do
C. when will they come D. when they will come
D
【解析】宾语从句。根据答语可知提问时间用特殊疑问词when；根据语序故选D。