Computers in offices and homes since 1970s. A．have been usedB．had been usedC．was usedD．has been used 题目和参考答案——青夏教育精英家教网—

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Computers ____ in offices and homes since 1970s.

A．have been used

B．had been used

C．was used

D．has been used

解析试题分析: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。
考点：考查动词时态语态。

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