文档介绍：新概念英语第一册答案Lesson129-130
A Complete these sentences using had to or must have ，用had to或must have been填空。
　　E had to buy a new one.
　　5 He forgot his case so he had to return home.
　　6 She must have been sleeping.
　　B
　　1 I don”t think they were. They can”t have been Canadian. They must have been Australian.
　　2 I don”t think she was, She can”t have been Finnish. She must have been Russian.
　　3 I don”t think they were. They can”t have been Japanese. They must have been Chinese.
　　4 I don”t think they were. They can”t have been butchers. They must have been bakers.

　　5 I don”t think she was. She can”t have been a dentist. She must have been a doctor.
　　6 I don”t think he was. He can”t have been a sales rep. He must have been the boss.
　　7 I don”t think she was. She can”t have been seventeen. She must have been twenty-one.
　　8 I don”t think they were. They can”t have been five. They must have been seven.
　　9 I don”t think he was. He can”t have been seventy-six. He must have been over eighty.
　　10 I don”t think she was. She can”t have been fifty-five. She must have been under fifty.
　　11 I don”t think it was. It can”t have been the 17th yesterday. It must have been the l6th yesterday.
　　12 I don”t think it was. It can”t have been Tuesday yesterday. It must have been Wednesday yesterday.