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        1. These boxes ______ for keeping the food clean and cool.
          A.useB.a(chǎn)re usedC.have usedD.were using
          B

          試題分析:句意:這些箱子是用來(lái)保持食物清潔和保鮮的。結(jié)合語(yǔ)境可知本句描述的是客觀性動(dòng)作,故用一般現(xiàn)在時(shí)態(tài)。主語(yǔ)是動(dòng)作對(duì)象,故用被動(dòng)語(yǔ)態(tài),選B。
          點(diǎn)評(píng):英語(yǔ)中的時(shí)態(tài)主要是借助于時(shí)間狀語(yǔ)與上下文語(yǔ)境來(lái)進(jìn)行判斷。解答此類題型,首先要注意句子中的時(shí)間狀語(yǔ),如果沒(méi)有則要通過(guò)分析上下文,結(jié)合語(yǔ)境來(lái)判斷句子的時(shí)態(tài)。語(yǔ)態(tài)的判斷主要是確定句子主語(yǔ)與謂語(yǔ)動(dòng)詞的關(guān)系。如果是主動(dòng)關(guān)系則用主動(dòng)語(yǔ)態(tài),反之如果是動(dòng)賓關(guān)系,則用被動(dòng)語(yǔ)態(tài),尤其要注意一些特殊動(dòng)詞的用法。
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