Question

I am sorry forget ________you________it last time. It does not matter. A.to tell , about

B.telling,about C.to tell ,on

Answer 1

A to tell , about
非常抱歉上次我忘记告诉你关于（某事）的情况了。

forget to do sth. 忘记去做某事
forget doing sth. 忘记做过某事

Answer 2

c

Answer 3

A 忘记做某事。
B 忘记做过某事。
所以选A

Answer 4

忘记做某事