請教一題文法
> The patient appreciate ___ breakfast in bed when she wasn't feeling well.
1. serving
2. being served
3. having been serving
4. having served
答案是2. 想請教為什麼? 4.為什麼不行呢?
謝謝幫忙

想想主被動

1.這位病人感激在身體不適時有床上早餐服務4.這位病人感激在身體不適時去提供床上早餐服務(很怪)1.→2.