The man spoke in a strange voice and I couldn't ____ whose voice it was.

pick out
取出,去掉
The child refuses to eat this fruit without first picking out the stones.
不把果核取出来,那个小孩就不会吃这水果.
挑选,选择; 选拔
They have picked out the best items on the menu.
他们从菜单上选出最好的菜.
分辨出
There were so many people at the conference that I couldn't pick him out.
参加会议的人太多了,我没法认出他.
了解; 领会
I picked out the meaning of the passage.
我领会了这段文章的含义.
衬托,点缀,使明显
The design was picked out in the bright red.
这图案在鲜红色衬托下很显眼.
凭听觉〔记忆〕奏出
She tried to pick out the tune of a song she had heard on the radio.
她试图凭听觉记忆摸索着奏出那首她从广播里听到的歌曲.