he bought a book yesterday,_______ author is a teather
A whose B of which C which D its
On the wall hangs a picture,___color is blue
选项和上面一样
They used to help me every time I was in trouble ,_______was very kind of them
A who Bwhich Cthat D it
改错
Those who has finished the work may go home
Anyone who want to have a bring future must study hard
The key which he opens the bike is missing
Was it because it snowed last night why you didn't come