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You are _____ to return the book to the library in two weeks

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You are _____ to return the book to the library in two weeks.A.supposed B.thought C.shouted I want to know how long_________.A.has he been backB.has he come back C.he has been back D.he has come back He said he would help me with my maths if he free.A.was B.will be C.would be D.is
1.A be supposed to 为固定短语:应该2.C 延续性动词用been,倒装句所以he在前3.C 将来时的虚拟语气