Where is Jack?I can`t find him anywhere .---He ___his homework upstars怎么填

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• Where is Jack?I can`t find him anywhere .---He ___his homework upstars怎么填
• Where is Jack?I can't find him anywhere.he___his homework upstairs.A must have done B must be doing我知道这里应该选择must be doing 理解为他正在楼上做作业.可是为什么不能选择must have done呢?这里不是问JACK在哪里吗?那应该表猜i测阿.must have done 不就是表猜测的嘛.如果不是的话,在哪种情况下用must have done 比较合适?
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• Where is Jim?O can't find him anywhere.DonWhere is Jim?I can't find him anywhere.Don'tyou know?He ___(go)to his hometown.When ___he ___(come)back?In a month.
• 英语问题do you know where david isDo you know where David is?I couldn`t find him anywhere.-Well.He( )have gone far-his coat is still here.A shouldn`t Bmustn`t C can`t D wouldn`tshould不是也可以表示推测吗,为什么答案是C而不是A呢?
• Where is Jack?I can`t find him anywhere .---He ___his homework upstars怎么填
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• Where is Jim?O can't find him anywhere.Don