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【答案】1. (1)There wasn’t a car in front of the house just now.
(2)Was there a car in front of the house just now?
肯定回答:Yes, there was
否定回答:No, there wasn't
2.(1)They didn't play football in the playground
(2)Did they play football in the playground
肯定回答:Yes, they did
否定回答:No, they didn’t
【解析】
略