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1. Whose.. is this/ are these?这/这些是谁的…?
Whose volleyba‖iths?这是谁的排球?
2Sb. must have done sth.某人一定做过某事think somebody must have picked it up.我想一定有人捡到它了
3. There must be sth./sb. doing sth.一定有某物/某人在做某事。
There must be something visiting the homes in our neighborhood定有什么东西在我们社区逗留…
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