问题补充:
—What are you busy with?
—The conference in our city next week.
A. held
B. will be held
C. be holding
D. to be held
答案:
A. held
B. will be held
C. be holding
(答案→)D. to be held
解析:考查非谓语动词,根据时间next week表示的是将来,故用不定式的被动式作定语,句意:你在忙什么?在我们市下周要举行的会议。故选D。