We can't understand----at poor little matchgirl.A.they laugh B.their laughing C.them to laugh
问题描述：
We can't understand----at poor little matchgirl.A.they laugh B.their laughing C.them to laugh
D.them why laugh 选哪个,为什么
答
B
their laughing 做understand 的宾语,
understand one's doing 理解某人的做法