摘要:1.My parents are all(A) doctors, and(B) they work(C) in a(D) large hospital. 2.All(A) our(B) comrades(C) agree to (D) you. 3.How long have(A) they arrived(B) at(C) the(D) reading room? 4.After he finished doing (A)his homework, Tom went on (B) writing(C) a letter to(D)one of his friends. 5.The old grandmother was very(A)tired(B) to walk on(C), so he policeman took her back(D).

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