Dr.Johnson, together with his wife and children, ------photo

选C
首先,在"A,together with B"结构中,A作主语,B放在介词with后做宾语,所以本句的主语是“Dr.Johnson”,单数,先排除B,D
其次,see 的被动语态有两种结构；
1.be seen to do sth.被看见做了某事
2.be seen doing sth.被看见正在做某事
所以,很显然排除A,选C
顺便说一下,A要改成“was seen to take ”才对.