----What are you busy with?
---- The conference in our city next week.
A. held
B. to be held
C. be holding
D. will be held
网友回答
A. held
(答案→)B. to be held
C. be holding
D. will be held
解析：句意：--你在忙什么？--在忙下周要举行的会议。这里是简略回答，只回答了The conference，它的后面是不定式作定语，因为下周举行，所以用不定式表将来，conference与hold之间是被动关系，故用不定式的被动式，故选B。