练习答案 Key to written exercises
Lesson 130
A
1 He didn't come to work yesterday. He must have been ill.
2 He didn't come to the office this morning. He had to stay a home.
3 I don't think she was Austrian. She must have been German.
4 I lost my pen so I had to buy a new one.
5 He forgot his case so he had to return home.
6 She didn't hear the phone. 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 16th yesterday.
12 I don't think it was. It can't have been Tuesday yesterday.
It must have been Wednesday yesterday.
13 I don't think it was. It can't have been the 19th yesterday.
It must have been the 20th yesterday.
14 I don't think it was. It can't have been cheap.
It must have been expensive.
15 I don't think it was. It can't have been easy.
It must have been difficult.
16 I don't think she was. She can't have been old.
She must have been young.
17 I don't think he was. He can't have been ill.
He must have been tired.
18 I don't think they were. They can't have been listening to the radio.
They must have been watching television.
19 I don't think she was. She can't have been retiring.
She must have been looking for a new job.
20 I don't think they were. They can't have been sitting.
They must have been standing.