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        1. —__________ do I have to change the robot’s batteries? —Every two months.
          A.How longB.How soonC.How oftenD.How many
          C
          本題的回答語意思為每?jī)蓚(gè)月,表示的是頻率,對(duì)此提問應(yīng)該用how often,故選C,how long對(duì)長(zhǎng)度提問,how soon對(duì)多久以后提問,how many對(duì)可數(shù)名詞數(shù)量提問。
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