下列各句中，标点符号使用正确的一项是[ ]

A．明天周末，你是在家复习功课呢，还是去展览馆参观？ 

B．我们应该研究一下，这件事究竟应该怎么办？

C．大家不会忘记“欲把西湖比西子，淡妆浓抹总相宜。”这一名句吧。

D．“这个问题，”袁明说：“让我好好考虑考虑。”

When we got to Yushu airport, we were told that they _____ more than 500 people from the ruins

(废墟) by earthquake. [ ]

A. has saved

B. saved

C. had saved

D. have saved