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作對象，故用被動語態(tài)，選C。
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