------It is a photo of ________ at the age of five.------How

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------It is a photo of ________ at the age of five.------How pretty they are!A.Lily`s and Lucy`s
------It is a photo of ________ at the age of five.
------How pretty they are!
A.Lily`s and Lucy`s \x05\x05B.Lily and Lucy`s
C.Lily and Lucy \x05\x05\x05D.Lily`s and Lucy
为什么选C不选B,求详解

选C Lily and Lucy 《新概念英语》1中有这样一句：This is a photograph of our village.就是说,of这个介词后的名词短语不要求用所有格形式.但在有一种情况下需要所有格形式,如：It is one of Lily and Lucy's photo.

------It is a photo of ________ at the age of five.------How at the age of five bill started drawing（）five A,in age B,at age of C at the age he is at the age of five.行不行? is this picture _____you drew at the age of five? At the age of five years old Wow!Look at this photo.It is a ---- of people the boy could ride a bike at the age of five(同意句) the boy could ride a bike at the age of five（同义句） He was ---- ----- ---- English at the age of five Compulsory education begins at the age of five,when children at the age of five,Martin weighed 25 kilos