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來源：網絡資源 2021-09-07 13:58:11
1. Whose.. is this/ are these?這/這些是誰的…?
Whose volleyba‖iths?這是誰的排球?
2Sb. must have done sth.某人一定做過某事think somebody must have picked it up.我想一定有人撿到它了
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定有什么東西在我們社區逗留…
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