2．This medicinehas saved （save） millions of people's lives since it was put into use．

分析 自從這種藥投入使用以來(lái)，它已經(jīng)拯救了成千上萬(wàn)的人的生命．

解答 答案：has saved 考查語(yǔ)法填空．根據(jù)句中時(shí)間狀語(yǔ)從句since it was put into use，主句要用現(xiàn)在完成時(shí)態(tài)，因主語(yǔ)This medicine是單數(shù)，助動(dòng)詞用has．

點(diǎn)評(píng) 考查語(yǔ)法填空，準(zhǔn)確地理解句子、翻譯句子，然后根據(jù)句意及提示確定所填單詞詞性，正確寫(xiě)出單詞完成句子，使句意更通順．

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