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  3. Without computers, we ______ the tremendous medical advancement in the last few decades.

Without computers, we ______ the tremendous medical advancement in the last few decades.

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问题 Without computers, we ______ the tremendous medical advancement in the last few decades.
选项 A、would not make
B、will not have made
C、could not make
D、couldn’t have made
答案D
解析 without引导的短语在句子中表示“要不是……”，此时句子要用虚拟语气，又由“the last few decades”可知是对过去情况的假设，故谓语要用couldn’t have done，故选D。
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