You be tired after working for eight hours without a rest.A. can; haveB. may; havingC. m

问题补充：

You be tired after working for eight hours without a rest.

A. can; have

B. may; having

C. must; having

D. need; to have

答案：

A. can; have

B. may; having

(答案→)C. must; having

D. need; to have

解析：句意:没有休息连续工作8小时，你一定累了。must 表示推测，意为一定，肯定，只用在肯定句中，否定句中用can。may 表示推测，意为可能，可用在肯定句或否定句中；without 是一个介词，后跟动词的ing形式。故选C。