Question

It's( )(help)of you to help me clean the classroom.

Answer 1

你好，这道题的正确答案是：

It's(helpful ) of you to help me clean the classroom.

be adj of + sb 固定用法，某人是怎么样的

你帮着我们打扫教室真是太有帮助啦　。

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^__^祝你学习进步，如果有疑问，请追问，
如果对你有所帮助，请千万别忘记采纳哟！
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Answer 2

helpful

对。。。有帮助。

【欢迎追问，谢谢采纳！】

Answer 3

真不理解现在这些出题老师都怎么想的,这句话改成 You're going to be a great help cleaning the classroom for me. 或者改成 You are a great help having cleaned the classroom for me. 这样不更自然.