-What are on show in the museum?[来源:Z+xx+k.Com] -Some photos by the children of Yushu Qin

问题补充：

-What are on show in the museum?[来源:Z+xx+]

-Some photos by the children of Yushu, Qinghai.

A. have been taken

B. were taken

C. are taken

D. taken

答案：

A. have been taken

B. were taken

C. are taken

(答案→)D. taken

解析：考查语态.根据题意，博物馆展出了什么？——一些青海玉树的孩子们照的相片。此句省去了前面主句内容，photos后为过去分词短语做定语。故用被动语态，选d。