-This is a photo of------when they were young.

-This is a photo of______when they were young.
-Oh,how happy they both looked!
A,my father and mother
B,my father and mother's
C,my father's and mother
D,my father's and mother's

选择A
翻译:这是一张我父母年轻时候的照片
如果选择B的话,就是强调“一张”,指他们很多张照片中的一张,但这句话的意思应该是A,就是指我父母年轻时的照片,不强调数量