请教一题文法
> 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. 想请教为什么? 4.为什么不行呢?
谢谢帮忙

想想主被动

1.这位病人感激在身体不适时有床上早餐服务4.这位病人感激在身体不适时去提供床上早餐服务(很怪)1.→2.