i'm sorry ___ you about it before.a.not to tellb.not to have told_英语解答

i'm sorry ___ you about it before.
a.not to tell
b.not to have told
为什么不选a?

人气：458 ℃　时间：2020-03-28 11:43:00

解答

b.not to have told
have done 意思是本来应该做,却没有做
我很抱歉,我本来应该提前告诉你,却没有.
祝好!