We were not the least surprised at David's being dismissed 求

DAvid's 所有格,后面必须是名词,或动名词
being 这里做动名词!
比如：His coming late made me angry
不懂追问!
再问： 请问Being 是be+ing吗 那这句话是不是被动语态？
再答： 这里是被动！大卫被解雇