— 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 finishedD.mustn’t have finished
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A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。