问题补充：
John has really got the job because he showed me the official letter him it.
A. offered
B. offering
C. to offer
D. to be offered
答案：
A. offered
(答案→)B. offering
C. to offer
D. to be offered
解析：考察现在分词作定语的用法。Letter与offer him it构成主动关系，使用现在分词分词形式。句意：约翰真的获得了那份工作因为他给我们展示了给他提供那份工作的信件。
