Computers ____ in offices and homes since 1970s. A．have been usedB．had been used
题型：不详难度：来源：
Computers ____ in offices and homes since 1970s. | A．have been used | B．had been used | C．was used | D．has been used |
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答案
| A |
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。 |
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