I’m sorry ______ answered your letter earlier.A、having notB、not havingC、not to

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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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