You______ all those calculations! We have a computer to do all that sort of thin

游客2025-03-20 7

问题 You______ all those calculations! We have a computer to do all that sort of thing.

选项 A、wouldn’t have done
B、mustn’t have done
C、needn’t have done
D、hadn’t done

答案 C

解析 wouldn’t have done是虚拟形式；mustn’t have done实际上不存在这种用法，表示对过去情况的否定推测用couldn’t have done；needn’t have done表示做了不必做的事，符合句意；hadn’t done是过去完成时形式。

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