Computers ____ in offices and homes since 1970s. 
A．have been usedB．had been usedC．was usedD．has been used
A

試題分析:考查動詞時態(tài)語態(tài)。根據(jù)since the1970s可以判斷句子用現(xiàn)在完成時，再根據(jù)主謂一致的原則可知A選項正確。句意：自從二十世紀七十年代以來，電腦被應(yīng)用于了家庭和辦公室。
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