You were out when i called you this morning ho,i____for a friend A was waiting B have waited为什么选B不选?A

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You were out when i called you this morning ho,i____for a friend A was waiting B have waited为什么选B不选?A

You were out when i called you this morning ho,i____for a friend A was waiting B have waited为什么选B不选?A
You were out when i called you this morning ho,i____for a friend A was waiting B have waited
为什么选B不选?A

You were out when i called you this morning ho,i____for a friend A was waiting B have waited为什么选B不选?A
还是我来解释下.
A was waiting 过去进行时,表示在过去某一时刻或某一段时间内进行或发生的动作,如果是一段时间需要具体到点,比如昨天的四点到五点我正在做什么,昨天早上的这个时候我正在做什么,虽然都是一段时间,但是这段时间是有长度的,并且是确定的,可以用过去进行时.
B have waited现在完成时,表示过去发生并且已经完成的动作对现在造成影响或后果,过去某一时间开始并一直持续到现在的动作或状态.
本句回答的时间针对的是this morning,是一段不能确定长度的时间,所以不能用过去进行时,不能选A,选B表示过去发生并且已经完成的动作对现在造成影响或后果,意思是今天早上我在等人,所以不在家,产生的后果是没有接你的电话.