we----at last A.found B.found them out C.look them D.find

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we----at last A.found B.found them out C.look them D.find
we----at last A.found B.found them out C.look them D.find

we----at last A.found B.found them out C.look them D.find
看起来是想表达我们最终找到了他们,是已经发生的事情,所以是过去时.look them语法不对,应该是looked at them.find作为发现的时候是及物动词,综上,选B,find out找出.