Computers          in offices and homes since 1970s.
A.have been usedB.had been used C.was D.has been used
A

試題分析:句意:自從20世紀(jì)70年代開始,電腦被用在辦公室和家里。因為與since連用時,前面的常用現(xiàn)在完成時,又因為Computers是復(fù)數(shù),故選A。
點(diǎn)評:本題難度適中。對動詞的考查是高考必考的內(nèi)容,需要掌握它們的詞義、用法、時態(tài)及語態(tài)等,對它們的考查在單選、完形及短文改錯中經(jīng)常出現(xiàn),足以引起考生的重視。
即學(xué)即練:--- I hear you _______ at Smith’s.
--- Yes, I________there for about three months.
A.work; had been working 
B.worked; was working
C.a(chǎn)re working; have been working 
D.worked; have worked
解析:C。句意::--我聽說你在史密斯那里工作。--是的,我一直在那里工作了3個月。根據(jù)句意選C。
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