2. 外语
  3. I’m sorry ______ answered your letter earlier.

I’m sorry ______ answered your letter earlier.

admin2008-11-13  39
问题 I’m sorry ______ answered your letter earlier.
选项 A、having not
B、not having
C、not to have
D、to not have
答案C
解析 be sorry to have done sth遗憾做了某事，否定时not加在前面。
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