问题补充：
---Can you see ?
---No. Let’s go and have a look. Maybe we can help them.
A. what are they doing there
B. why are they talking there
C. what is happening there
D. what are they talking about
答案：
A. what are they doing there
B. why are they talking there
(答案→)C. what is happening there
D. what are they talking about
解析：根据特殊疑问句作宾语从句时，要用陈述句语序，故选C
