He has no trouble working on this problem,句子中为什么用 no,为什么用 on?

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• so he is finding this trip very exciting为什么用现在进行时呢My brother has never been abroad before,so he is finding this trip very exciting.find 觉得的意思,为什么使用现在进行时呢,是新概念中的句子,大家联系上下文帮我分析一下好吗激动人心的旅行I have just received a letter from my brother,Tim.He is in Australia.He has been there for six months.Tim is an engineer.He is working for a big firm and he has already visited a great number of different places in Australia.He has just bought an Australian car and has
• He has no trouble working on this problem,句子中为什么用 no,为什么用 on?
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• He has no trouble working on this problem,句子中为什么用 no,为什么用 on?
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