题目内容：

my grandpa went to the barber's to have his hair __.A to cut B cut C cutting D being cut 为什么选B

优质解答

to have something done 是固定搭配.cut 的过去分词还是cut.所以选B
例如：I have my bicycle repaired.

追问：

也有have something do的呀，还有have something doing

追答：

Have something to do 是还有什么是要做。如：I have some home work to do. have something doing？ 这里my grandpa went是过去时，已经去过了，所以是have something done.