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The shop had already opened when we arrived so we __ outside

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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.
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.