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写出下列画线部分词的词性和结构名称，总结能够做主语的词类和结构 1.Smoking is harmful to the health. 2.The rich should help the poor....
题目内容：
写出下列画线部分词的词性和结构名称，总结能够做主语的词类和结构
1.Smoking is harmful to the health.
2.The rich should help the poor.
3.When we are going to have an English test has not been decided.
4.It is necessary to learn a foreign language.
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