Smoking is a major factor contribute to cancer.请分析一下这个句子.

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Smoking is a major factor contribute to cancer.请分析一下这个句子.
这句话有两个动词了.be 和 contribute
如果它是一个主语从句的话,是不是应该写成That smoking is a major factor contribute to cancer.因为我记得助于从句that应该是不可以省略的呀.可是这又是字典里的句子,
应该不会错.我脑子混了.
如果它是一个定从，that就应该是在从句中作主语，做主语怎么能省略呢。

那个不是主语从句吧要是这个也太蹩脚了应该是 Smoking is a major factor (that) contribute to cancer.定语从句

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