I must ______(道歉) for not having been able to write to you sooner.-英语

题目简介

I must ______(道歉) for not having been able to write to you sooner.-英语

题目详情

I must ______(道歉) for not having been able to write to you sooner.
题型:阅读理解难度:偏易来源:不详

答案

apologize
用原形,因为是用作情态动词的后面。

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