问题补充：
--- What are you busy with?
---The exhibition in the city next week．
A. held
B. will be held
C. to be held
D. being held
答案：
A. held
B. will be held
(答案→)C. to be held
D. being held
解析：考查不定式做定语。根据句中的next week说明指的是未来的事情，故使用不定式表示未来，A项表示被动和已经完成；D表示正在进行；句意：—你在忙什么？—忙着下个星期在这个城市里举行的展览。故C正确。
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