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