Question

Computers ____ in offices and homes since 1970s. 

A．have been used

B．had been used

C．was used

D．has been used

Answer 1

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。