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        1. Computers are very useful in our lives, but they must        properly.
          A. use                 B. be using                C. be used
          C

          試題分析:句意:電腦在我們的生活中非常有用,但是必須恰當(dāng)?shù)厥褂盟鼈。結(jié)合語境可知下文主語是動(dòng)作對象,故用被動(dòng)語態(tài),選C。
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