Question

Computers          in offices and homes since 1970s．

A．have been used

B．had been used

C．was

D．has been used

Answer 1

A

試題分析：句意：自從20世紀(jì)70年代開(kāi)始，電腦被用在辦公室和家里。因?yàn)榕csince連用時(shí)，前面的常用現(xiàn)在完成時(shí)，又因?yàn)镃omputers是復(fù)數(shù)，故選A。
點(diǎn)評(píng)：本題難度適中。對(duì)動(dòng)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(shí)態(tài)及語(yǔ)態(tài)等，對(duì)它們的考查在單選、完形及短文改錯(cuò)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(tīng)說(shuō)你在史密斯那里工作。--是的，我一直在那里工作了3個(gè)月。根據(jù)句意選C。