I fell into deep thoughts，这是改错题中的一句话。

I fell into deep thoughts，这是改错题中的一句话。
原文Last week ,I met a stranger who seemed to be losing .I offered to guide him to a place he wanted to go to ,but to my surprise ,he refused my offer to helping . I asked him why not . He told me that he was afraid I would ask him money if I helped him in this way . Then I fell into deep thoughts :Was it money which came between us ? I agree that money is become more and more important in our society ,and it should not be everything . We should try my best to help others and trust each other . If everyone does this ,our society will be better and better . 我觉得这句话中的thought是沉思，应该是不可数名词。