选b这句话的意思是：史密斯太太盼望他回来，就跟他盼望见到她一样急切。这里插入了as much...as...短语，比较的是look forward to后面的宾语his return 和seeing her:Mrs Smith was looking forward as much （to his return） as he himself (to seeing her).也可以这样理解:as much...as he himself was looking forward to seeing her.
