— 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 finishedB．must finishC．can’t have finished D．mustn’t have finished
A
考查情態(tài)動詞用法。對現(xiàn)在的推測用：情態(tài)動詞+do/be;對過去的推測用：情態(tài)動詞+have done/been;
對過去情況的肯定推測用must have done必定做了某事；否定推測用can’t have done不可能做了某事。
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