新概念英语第一册90课课后练习答案 Key to written exercises

　　Lesson 90

　　A

　　1 Did the sun set at twenty past seven?

　　The sun didn't set at twenty past seven.

　　2 Did he eat his lunch at one o'clock?

　　He didn't eat his lunch at one o'clock.

　　3 Did they do their homework last night?

　　They didn't do their homework last night.

　　4 Did he come by car this morning?

　　He didn't come by car this morning.

　　5 Did the sun rise at half past five?

　　The sun didn't rise at half past five.

　　6 Did you swim across the river yesterday?

　　We didn't swim across the river yesterday.

　　B

　　1 Yes, I did my homework last night.

　　He hasn't done his homework yet.

　　2 Yes, Mrs. Jones went to the butcher's this morning.

　　Mrs. Williams hasn't been to the butcher's yet.

　　3 Yes, I spoke to him yesterday.

　　She hasn't spoken to him yet.

　　4 Yes, George swam across the river an hour ago.

　　Sam hasn't swum across it yet.

　　5 Yes, I saw that film yesterday.

　　Sam and Penny haven't seen that film yet.

　　6 Yes, Tim took off his shoes a minute ago.

　　Frank hasn't taken off his shoes yet.

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