2. 外语
  3. Computers will develop more successfully because they enable us to fulfill tasks that wasn’t able to undertake ever before.

Computers will develop more successfully because they enable us to fulfill tasks that wasn’t able to undertake ever before.

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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 tasks和undertake之间是被动关系，故排除D。本题要表达的是，本来过去可能是连做都不会开始做的任务，现在却可以完成了，C最符合这个意思，“could(not／never)have done”指“本可能(不)”，因此C正确。A只是简单的否定，没有“本…”这样的意味，若选A，则变成“完成不能去做的任务”，有逻辑的漏洞。mustn’t have…表示“肯定还没”，但题意表明现在“已开始做了”。
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