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  3. You______all those calculations! We have a computer to do that sort of thing.

You______all those calculations! We have a computer to do that sort of thing.

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问题 You______all those calculations! We have a computer to do that sort of thing.
选项 A、needn’t have done
B、must not have done
C、shouldn’t have done
D、can not have done
答案A
解析 本题考查的是一组情态动词。按照后面一句的意思来推测，前面讲的是：“你已经做完了全部计算，而这是没有必要的”。needn’t have done sth．表示的正是这一意思，例如：You needn’t have told him about it．He’s already known about it你本来不用告诉他这件事，因为他早已知道了。You needn’t have woken him up．He doesn’t have classes today．你本来不用叫醒他，他今天没课。故A最符合题意。must not表示“不可以”，后面一般不接完成时，故B错误。shouldn’t have done sth意为“本来不应该做某事反而做了”，含有责备之意，例如：You shouldn’t have told him about his illness．你不该把病情告诉他。You shouldn’t have lent him so much money．He is not in the habit of paying it back．你不该借给他这么多钱。他没有还钱的习惯。由此可见，C也不符合题意。因为“已经做了计算”并不是什么错事，只是没有必要而已。can’t have done sth表示不可能做某事，表示对过去事情的否定推测，是must have done sth的否定形式，例如：They can’t have finished thework so soon．这项工作他们不可能完成得这么快。He can’t have gone to Beijing，for I sawhim just now．他不可能去了北京，刚才我还看见他了。可见，D也不符合题意。
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