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what do you think . with the old machine? is the matter还是the matter is 为什么

题目详情
what do you think . with the old machine? is the matter还是the matter is 为什么
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答案和解析
填 is the matter
What is the matter with the old machine?这是句子主干“这台旧机器出什么毛病了?”
do you think是插入语