can you see ____?No.Let's go and have a look .

问题描述:

can you see ____?No.Let's go and have a look .
-can you see ____ ?
-No.Let's go and have a look .Maybe we can help them.
A.what was going on there B.what are they doing there
C.what were they doing there D.what is going on there(请说明)

选第四个.
what are they doing表示他们正在做什么.
而第四个表示有事情发生.