I still can't find the pen that I've been __ for.为什么用looking

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I still can't find the pen that I've been __ for.为什么用looking,为什么不用look.

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 That's the very thing I've been looking for I still can not find the pen I have been___for. 2.i've （）all the photos inthe drawer ,but i still can't find I've---all my pockets but I still can't find my key to the b 介词填空 I'm looking for my pen __a long time,but I can't find i I'm ___ my pen,but I can't ___ it.A.look for,find B.looking I've been looking for you all over the place. 怎么回答 I've been looking for the answer Where are mt pen? I can't find __(they). I've been looking for you all over the place.还是 I've been al what i`ve been looking for歌词