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职称英语
Computers will develop more successfully because they enable us to fulfill tasks
Computers will develop more successfully because they enable us to fulfill tasks
游客
2025-01-30
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问题
Computers will develop more successfully because they enable us to fulfill tasks that
wasn’t able to undertake ever before
.
选项
A、couldn’t be undertaken
B、mustn’t have been undertaken
C、could never before have been undertaken
D、would never before have undertaken
答案
C
解析
(1)画线部分错误分析。
本题的考点为could表示“可能”的用法。can和could都可以表示“猜测”,相当于汉语的“有可能”,一般不分时态,具体区别如下:
①表示理论上的可能性,可用can(表现在)或could(表过去)。
e.g.Even experts can make mistakes.
即使是专家也可能会出差错。
②表示现实可能性,即可指将来可能性也可指现在可能性。
e.g.We could go to Japan this summer.
今年夏天我们可能要去日本。
③用语虚拟语气时只能用could。
e.g.If I could go with you,I should feel very glad.
假如我能同你们一起去,我会感到非常高兴。
④could have done表示过去本来可能发生的情况,而实际上没有发生,通常译为“本来可以”“本来可能”等。
e.g.I could have passed my examination easily but I made too many stupid mistakes.
我本可以轻易通过考试,但我犯了太多不该犯的错误。
本题是对过去的可能性所做的论断,所以应是could never before have been undertaken。
(2)选项分析。
本题中,因为是对过去的可能性所做的论断,所以排除选项A;must have done是对过去发生的事情的肯定猜测,与题意不符,故排除;D选项为虚拟语气在if非真实条件句中的用法,所以本题的正确答案是C。
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