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Without computers,we---____ the tremendous medical advanceme

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Without computers,we---____ the tremendous medical advancement in the last few
A.would not make B.will not have made
C.could not make D.couldn’t have made
Without computers,we---____ the tremendous medical advanceme
D.
本句为虚拟语气,而且是对过去的虚拟,所以主句用would/could have done的形式,否定形式是在助动词后加not.本句译为:如果没有电脑,我们不可以在过去的几…里取得这么大的医学进步.