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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 考查情态动词。needn’t have done sth．意为“本不必做某事，但实际上做了”，没有must not have done sth．这种否定推测的表达方式，shouldn’t have done sth．意为“不该做某事但做了”，can not have done sth．意为“不可能做某事”，句意为“你本不必做那些计算，那些事情可由我们的电脑来做”。故选A。
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