I did all the exercises through Part1 to Part5.Oh,you really___;only Part 1 is required.A.didn't need to.B.needn't have为什么A不能选.A.B有什么区别

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I did all the exercises through Part1 to Part5.Oh,you really___;only Part 1 is required.A.didn't need to.B.needn't have为什么A不能选.A.B有什么区别

I did all the exercises through Part1 to Part5.Oh,you really___;only Part 1 is required.A.didn't need to.B.needn't have为什么A不能选.A.B有什么区别
I did all the exercises through Part1 to Part5.
Oh,you really___;only Part 1 is required.
A.didn't need to.B.needn't have
为什么A不能选.A.B有什么区别

I did all the exercises through Part1 to Part5.Oh,you really___;only Part 1 is required.A.didn't need to.B.needn't have为什么A不能选.A.B有什么区别
didn't need to do sth是陈述某事不需要做,不一定做了,needn't have done sth是某事不需要做却已经做了,这道题中明显属于第二种情况,所以应该选B.

你好,本题句意是“我做了Part1到Part5的所有练习”,“你不必做这么多,只需要做Part1就行”。第一个人陈述了他做了一到五的练习的事实,这件事已经完成了,因此第二个人回答是应该用现在完成时而不是一般过去时。

这第二个选项完整形式是needn't have done all the exercises , 第一个选项是一般形式,这个题里说明的是作业已经做过了,故选择完成时