问题补充:
— Do you know ?
— Next Sunday.
A. what they will do
B. where they will do
C. when they will come here
D. who they will meet
答案:
A. what they will do
B. where they will do
(答案→)C. when they will come here
D. who they will meet
解析: 四个选项分别表示要做什么、要做哪儿(语义不通)、什么时候来这和他们要见谁。根据答语下个星期日,可知前文问的是时间,选C。