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    精英家教网 > 高中英语 > 题目详情
    Computers ____ in offices and homes since 1970s. 
    A．have been usedB．had been usedC．was usedD．has been used
    A

    试题分析:考查动词时态语态。根据since the1970s可以判断句子用现在完成时，再根据主谓一致的原则可知A选项正确。句意：自从二十世纪七十年代以来，电脑被应用于了家庭和办公室。
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