Iheartheyhavepromotedjohn,buthedidn'tmention     whenw...

问题详情：

 I hear they have promoted john, 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

【回答】

B

知识点：非谓语动词

题型：选择题