The boys are sweating all over. They（）.
A. must be working
B. must have been working
C. may be working
D. must work
出自：国家开放大学管理会计案例
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The boys are sweating all over. They（）.
A. must be working
B. must have been working
C. may be working
D. must work
出自：国家开放大学管理会计案例