____ are the birds doing?The birds are sing in the tree.选Where还是What 为什么?

题目

____ are the birds doing?The birds are sing in the tree.选Where还是What 为什么?
____ are the birds doing?The birds are sing in the tree.选Where还是What 为什么?

答案

What 因为问句里没说明鸟在干什么,所以重点在动作sing,应该用what 提问