i am having trouble finding out who has taken my book.为什么用fi

i am having trouble finding out who has taken my book.为什么用fi What's the matter?I am having trouble _who has taken my book what's the matter?I am having trouble ( ) who has taken my b -What's the matter?-I'm having trouble _______ who has taken I had trouble finding out the answer to the question 为什么用to 麻烦大家帮我分析一下这个句子成分：we are having trouble in finding out who ha 用英语回信Dear Miss Wang,I am having some trouble with my classma 英语翻译W:I am sorry I am having trouble reading my notes.Did yo my book has disappeared.who______have taken it? who ( ) my English book It was here just now ,but I can't fi I was having a hard time finding the school.这个句子为什么用having I am having some trouble with my classmates at the moment里面的