选A
选B的话应该是
I regretted not being able to help
not的位置错了
be not able to do sth be unable to do sth区别
1个回答
相关问题
-
be unable to do与be not able to do有什么区别
-
succeed in doing sth 是否等于be able to do sth
-
be used to…“be used to do sth” 和 “be used to doing sth” 的区别?
-
be able to do sth 意思 用法!
-
be consided to do sth 和be supposed to do sth 有什么区别
-
be able to do sth 它与 can 有什么区别
-
used to do sth,be used to sth ,be used to do sth
-
be used to doing sth和be used to sth的区别
-
used to do sth 和be used to doing sth的区别
-
ought to do sth.,be supposed to do sth与should do sth有何区别