—The 3G mobile phone has influenced people’s life a lot since it ___
A．inventsB．invented
C．is inventedD．was invented
D
   
試題分析：句意：自從3G手機被發(fā)明，他們已經(jīng)對人們的生活有了很大的影響。since自從……，后加過去時態(tài)的句子或過去的時間點。被動語態(tài)表示主語是動作的承受者，即行為動作的對象。被動語態(tài)由“助動詞be＋及物動詞的過去分詞”構(gòu)成。一般過去式的被動語態(tài)構(gòu)成was／were＋tdone，根據(jù)語境故選D
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