what's the matter?I am having trouble ( ) who has taken my bookA.looking for B.finding out 我选A,我觉得是正在找,还没有找到

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what's the matter?I am having trouble ( ) who has taken my book
A.looking for B.finding out
我选A,我觉得是正在找,还没有找到

look for意为“寻找”,是有目的地找,强调“寻找”这一动作.如:
—What are you looking for?
你在找什么?
—I'm looking for my bike.
我在找我的自行车
find out着重表示通过理解、分析、思考、询问等“弄清楚”“查明”一件事情,其后的宾语常常是某个情况、事实.如:
Please find out when the train leaves.
请查一下火车什么时候离站
明白?