Computers in offices and homes since 1970s．A．wasB．had been usedC．have b

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Computers in offices and homes since 1970s．

A．was

B．had been used

C．have been used

D．has been used

答案

解析

试题分析：考查动词的时态与语态。句意：自从20世纪70年代以来，电脑就被广泛的应用在办公室与家庭。根据时间状语sinec 1970s，这是现在完成时的标志，电脑与应用之间是被动关系，故选C项。
考点 : 考查动词的时态与语态

举一反三

The girl ______ in America for years． After graduation, she returned home, quite at a loss during her hunt for a job．

A．was studied

B．has been studied

C．studied

D．was studying

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—How long _______ at this job?
　　—Since 1990.

A．were you employed

B．have you been employed

C．had you been employed

D．will you be employed

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—When will you come to see me, Dad?
　　—I will go to see you when you _______ the training course.

A．will have finished

B．will finish

C．are finishing

D．finish

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He _________ to go through the hard times and finally became a famous artist.

A．succeeded

B．managed

C．tried

D．enabled

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We wanted to get home before dark, but it didn"t quite as planned.

A．make out

B．turn out

C．go on

D．come up

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