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【答案】1. was 2. were 3. were 4. was 5. have
【解析】
1. she是第三人称单数,对应的be动词是is,而is过去式是was,故选择was。
2. Ken and Mocky看作一个整体,是复数,对应的be动词是are,而are的过去式是were,故选择were。
3. Ken and Ann看作一个整体,是复数,对应的be动词是are,而are的过去式是were,故选择were。
4. Martians是复数,对应的be动词是are,而are的过去式是were,故选择were。
5.last night是一般过去时常用的时间状语,而had是过去式,故选择had。