The shop had already opened when we arrived so we __ outside in the street.A.needn't wait B. didn't need to wait 为什么选B不选A呢.请详细解释一下.谢谢.是不是在过去式中,假如要用的话,只能用need have done.

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The shop had already opened when we arrived so we __ outside in the street.A.needn't wait B. didn't need to wait 为什么选B不选A呢.请详细解释一下.谢谢.是不是在过去式中,假如要用的话,只能用need have done.
The shop had already opened when we arrived so we __ outside in the street.
A.needn't wait B. didn't need to wait 为什么选B不选A呢.请详细解释一下.谢谢.是不是在过去式中,假如要用的话,只能用need have done.

The shop had already opened when we arrived so we __ outside in the street.A.needn't wait B. didn't need to wait 为什么选B不选A呢.请详细解释一下.谢谢.是不是在过去式中,假如要用的话,只能用need have done.
首先应该明白 didn't need to wait 表达的含义是过去没有必要做某事,而实际上也未做.
另外还有个常用的是needn't have done sth 表达的是过去没必要做某事,但实际上确做了,这是虚拟语气里经常用到的.而 needn't wait 单纯的表达不必做某事,时态也与本题不符,
本题想表达的是商店过去已经关门了,我们过去没必要再在外面等了.

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didn't need to do意思是过去本不需要做（但事实是已经做了），带有后悔的口吻。
needn't do意思只是过去不需要做
不一定这样。
need可以是实意动词和情态动词，你说的这种用法指的是need做情态动词时的情况，当need做实意动词时，可以直接用过去式needed。
怎么判断need是做实意动词还是情态动词只要看need后面加什么，加名词（含动名词）的话need为实意，加动词原形的话need为情态。
例子 I needed you. 我曾需要你（need为实意动词）
I need have finished my homework yesterday.我昨天就该完成作业（need为情态动词）

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B里的need是动词词性。因此否定形式有助动词。看看下面百度词条里的解释
名词 n.
1.需要;必要;需求;要求[S][(+of/for)][+to-v]
We have no need to be afraid of them.
我们不必怕他们。
2.必要之物;需求[P1]
3.贫穷;困窘;危急[U]
My neighbors helped me in my time of need.
我的邻居在我困难的日子帮了我忙。
及物动词 vt.
1.需要,有...必要[W][+to-v][+v-ing][O2][O4][O7]
The garden needs watering.
花园该浇水了。
I don't think you need to worry about this.
我认为你不必为这事担心。
They need our help.
他们需要我们帮助。
不及物动词 vi.
1.生活穷困
助词 v.aux.
1.(多用于疑问句和否定句)需要,必须
Need you go so soon? 你需要这么早走吗 ? You needn't trouble about that. 你不必为这费事了。

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needn't have done 本来不用做的(却做了)(虚拟语气); 表示本来用不着做某事，而实际上已经做了; 表示过去没有必要做什么但已经做了.;
这题不是虚拟语气，说的是事实。
至于A和B的问题。有时need是实意动词，需要，有时是情态动词，有必要。
我们不需要等了，所以是B
而不是什么必要不必要的问题。意思上搞清楚就行了。...

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