题目内容：

What are on show in the museum?
Some photos____by African children.
A.are taken B.were taken C.taken D.have been taken

优质解答

C 问句问的是what.所以回答只要问答what的部分.不需要are 这样的动词来形成一个完整的句子.所以回答部分其实只要some photoes就可以了,那么所缺空即是修饰photo,相当于定语从句some photoes(which are taken )by african children.