You be tired; you have been working for so long a time but he be tired; he has just begu

问题补充：

You be tired; you have been working for so long a time,

but he be tired; he has just begun to work.

A. may not; must

B. must; may not

C. can’t; must

D. must; can’t

答案：

A. may not; must

(答案→)B. must; may not

C. can’t; must

D. must; can’t

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