My dog Jimmy loves _____ with a comb.
Every time I comb his hair, he will close his eyes and fall asleep.
============================
(A) to brush (B) brushing (C) to be brushing (D) being brushed
=============================
答案似乎是D 想請問一下為什麼不能用A或B?
如果brush是動詞 按照文法規則轉成動名詞或不定詞不也可以用嗎?