----What are you busy with?-- The conference in our city next week.A. heldB. to be held

问题补充：

----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

答案：

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。