问题描述：
What are on show in the museum?-Some photos _____by the children of Yushu,
What are on show in the museum?
-Some photos _____by the children of Yushu,Qinghai.
A.have been taken B.were taken C.are taken D.taken
What are on show in the museum?
-Some photos _____by the children of Yushu,Qinghai.
A.have been taken B.were taken C.are taken D.taken
问题解答：
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