have been doing是现在完成进行时,表示从过去某一时刻一直在做某事,只强调做的过程不强调结果,这里就是“我仍然找不到我一直在找的钢笔”,后面的定语从句只强调“找”这个动作,这里很明显不能用look,因为前面的have been后面要么接ing形式,要么接ed形式表示被动,不会接动词原形的,也就是说后面最多只能用have looked fo
I still can't find the pen that I've been __ for.为什么用looking
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