how mary regretted( )her boyfriend so rudely though she couldn't bear him smoking in her office.
问题描述：
how mary regretted( )her boyfriend so rudely though she couldn't bear him smoking in her office.
a.being treated
b.to treat
c.to have treated
d.having treated
答
D
首先看regret的用法,
regret to do 很遗憾要做某事
regret doing 后悔做了某事
根据时态或句意都可看出是后悔做了某事,所以用ing
排除B,C
由句意应该是,mary粗鲁的对待boyfriend
不是A,mary被粗鲁的对待
译为：虽然玛丽难以忍受男友在她办公室抽烟,但她还是很后悔那么粗鲁的对待他.