Question

21. I am sorry____________ written you a letter at the time. A. to have not B. to not have C. not to

到你是哪个啊

Answer 1

not to have
原句是i am sorry to 但要否定前移，所以是选C
绝对是这个啊。
翻译：我很抱歉没能及时给你写信。
LZ不妨将I am sorry not to have written you a letter at the time百度下。绝对是正确的句式

Answer 2

B. to not have
希望我的回答能够帮到你，望采纳！
祝你学习进步，天天快乐。O(∩_∩)O

Answer 3

选C，not to have

我很抱歉没能及时给您回信。

希望可以帮到你

Answer 4

c not to have