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—__________ do I have to change the robot’s batteries? —Every two months.
A.How longB.How soonC.How oftenD.How many
C
本题的回答语意思为每两个月,表示的是频率,对此提问应该用how often,故选C,how long对长度提问,how soon对多久以后提问,how many对可数名词数量提问。
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