2. 外语
  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.

admin2015-02-14  15
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 本句是情态动词need后接完成时的用法。need作情态动词用时，通常用于否定句或疑问句中。 “needn’t+have+过去分词”表示“过去做了某事，但事实上没有必要做”。
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