That is what I have been expecting since my childhood.为何不用过去完成时?

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That is what I have been expecting since my childhood.为何不用过去完成时?
That is what I have been expecting since my childhood.为何不用过去完成时?

That is what I have been expecting since my childhood.为何不用过去完成时?
此句表达的是从我的童年开始到现在一直期望的事.表示一段持续的时间.所以需要用到have been doing.

表示一段持续的时间

没有过去的过去为什么要用过去完成时态呢
况且句子中有since 就用完成时态 又是一直影响到现在 就用现在完成进行时