问题补充：
I hear they’ve promoted Tom, but he didn’t mention when we talked on the phone.
A. to promote
B. having been promoted
C. having promoted
D. to be promoted
答案：
A. to promote
B. having been promoted
C. having promoted
D. to be promoted
解析：本题考查非谓语动词的用法。mention to do sth. 提到将要做某事 mention doing sth.提到已经做过某事，本题应用完成被动式，D项应改为 mention to have been done 。
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