I have been (looking for) my lost keys,but I haven't found them t_英语解答

I have been (looking for) my lost keys,but I haven't found them till now括号中为什么要用
looking for

人气：150 ℃　时间：2020-06-03 05:27:28

解答

这句话整体是现在完成进行时,就是一直在做某件事.
句子翻译：我一直在找我丢失的钥匙,但是我现在还没找到.
look for意思是寻找.