Global warming caused by human activities?a major concern for people all over the world.为什么是has become不应该是have become吗?定语从句的先行词是Global warming 还是 human activities
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![Global warming caused by human activities?a major concern for people all over the world.为什么是has become不应该是have become吗?定语从句的先行词是Global warming 还是 human activities](/uploads/image/z/9083436-60-6.jpg?t=Global+warming+caused+by+human+activities%3Fa+major+concern+for+people+all+over+the+world.%E4%B8%BA%E4%BB%80%E4%B9%88%E6%98%AFhas+become%E4%B8%8D%E5%BA%94%E8%AF%A5%E6%98%AFhave+become%E5%90%97%3F%E5%AE%9A%E8%AF%AD%E4%BB%8E%E5%8F%A5%E7%9A%84%E5%85%88%E8%A1%8C%E8%AF%8D%E6%98%AFGlobal+warming+%E8%BF%98%E6%98%AF+human+activities)
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