不懂,求理由.What are on show in the museum?Some photos ____ by th

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不懂,求理由.
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
希望你们可以把ABC错的原因告诉我.

首先要清楚回答的那句是个省略句,完整的应该是
Some photos taken by the children of Yushu,Qinghai (are on show in the museum).
括号中的内容是被省略了的,所以可以看出原句就是一个很长很长的主语而不是完整的句子,所以任何带有谓语动词的选项都不能选,因为这句真正的谓语动词是被省略掉的are,直接排除其他选项.

不懂,求理由.What are on show in the museum?Some photos ____ by th 1道英语单选.-What are on show in the museum? -Some photos _ by th What are on show in the museum?Some photos——by the children -What are on show in the museum?-Some photos _ by the childr 英语：What are on show in the museum?-Some photos _ by the chil What are on show in the museum?一一Some photos（）by the childre what are on show in the museum?====Some photos【】by African --What are on show in the museum?--Some photos ___ by Africa What are on show in the museum?-Some photos _____by the chil What are on show in the museum?some photos ____by the childr --What are on show in the museum?----Photos ___(take) by Ame What are on show in the museum?—Some photos________ by Afric