问题详情：
--Must we finish giving out the posters today?
--Yes, we _______. It can't be put off any longer. [太原市]
A. can B. may C. must
【回答】
C。
解析： 此题考查情态动词的用法。回答由must引起的一般疑问句，其肯定答语要用must，不能用can或may。故选C。
知识点：情态动词
题型：选择题
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