题目内容：

Mr Black showed his some photos____ at World Expo 2010 Shanghai
A.being taken
B.taken
C.to be taken
D.having taken

优质解答

选B.
被动语态,排除D.A being表现在,C to be表将来

追问：

哪里提示是被动语态？

追答：

从句的主语是photos，，照片是被拍摄的 如同 理发 是 hair cut