The thin girl is their nurse.分别对the thingirl和 their nurse提问

楼上两位第一题都不对
是对the thin girl 提问，不是对the thin 提问
答案 ：who is their nurse?
对their nurse 提问是问这女孩儿是做什么的。
答案：what is the thin girl?

which girl is their nurse？

whose nurse is the thin girl？

1. Which girl is their nurse?

2. Who is the thin girl?或者
What is the thin girl? (那个瘦女孩是干什么的)

The thin girl is their nurse.

这瘦女孩 是他们的护士。