问题补充：
--Could you tell me ?
-- No. Let’s go and have a look. Maybe someone is hurt, and we can help him.
A. what was happened there
B. when they are doing there
C. what is going on there
D. what they were going on there
答案：
A. what was happened there
B. when they are doing there
(答案→)C. what is going on there
D. what they were going on there
解析：此题重点考查宾语从句的时态和语序问题，无论哪种句式结构充当宾语从句都要用陈述句语序，从句的时态要和主句的时态保持一致。
