OurModelUnitedNationsSchoolTeamwillbeleavingforShanghai...

问题详情：

Our Model United Nations School Team will be leaving for Shanghai to attend the conference soon, for which the teammates　　　　for nearly a month.

ared                                                   d have prepared

preparing                                            been preparing

【回答】

D

知识点：动词时态与语态

题型：选择题