问题补充:
Lily regretted to Mary’s birthday party last Sunday.
A. not to go
B. not having been going
C. not going
D. not to be going
答案:
A. not to go
B. not having been going
(答案→)C. not going
D. not to be going
解析:考查非谓语动词,Regret后接动名词作宾语。句意:莉莉后悔上周没去玛丽的聚会。