Computers will flourish because they enable us to accomplish tasks that

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问题 Computers will flourish because they enable us to accomplish tasks that

选项 A、could never before have been undertaken
B、would never before have undertaken
C、couldn’t be undertaken
D、mustn’t have been undertaken

答案A

解析此题只要正确理解了句子的意思，做出正确选择并不难。句意为："计算机使人们得以干以前干不了的事，因此它将兴旺发达起来"。用could never before have been un—dertaken暗含虚拟语气的意义。虽然B项也是虚拟形式，但语态不对。

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