— Can you imagine what is Jack doing now? He is playing football outside while everyone else is busy in class!
— He his homework, I think.
A. must have finished
B. must finish
C. can’t have finished
D. mustn’t have finished
网友回答
(答案→)A. must have finished
B. must finish
C. can’t have finished
D. mustn’t have finished
解析：考查情态动词用法。对现在的推测用：情态动词+do/be;对过去的推测用：情态动词+have done/been;
对过去情况的肯定推测用must have done必定做了某事；否定推测用can’t have done不可能做了某事。