英文题___ you have done might do harm to other people.A.What B.That C.Whether D.Which此题为什么选A 可以选B吗 为什么

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英文题___ you have done might do harm to other people.A.What B.That C.Whether D.Which此题为什么选A 可以选B吗 为什么

英文题___ you have done might do harm to other people.A.What B.That C.Whether D.Which此题为什么选A 可以选B吗 为什么
英文题___ you have done might do harm to other people.A.What B.That C.Whether D.Which
此题为什么选A 可以选B吗 为什么

英文题___ you have done might do harm to other people.A.What B.That C.Whether D.Which此题为什么选A 可以选B吗 为什么
主语从句,从句中缺少do的宾语,所以用what.名词性从句中缺少句子成份,主语,宾语等,用what代替,不能用that.

What=Things that，可以作主语
只用that就缺少了主语

以WHAT引导的主语从句 主句为what you have done 如果换做是that 主语只是that

这是一个主语从句，从句作主语。从句部分是——you have done，这个主语从句又缺少成分，故填what。当从句成分完整时可以用That来引导。例如：（That he finished writing the composition in such a short time） surprised us all.

That则主要用来“这”“那”和前有定语从句主词的情况下。whether是迷惑项，但它常和or连用，which 则一般用在非限中，不能引导主语从句。what 可以引导主语从句，即利用加一个what将you have done转换为一个从句

诶，凭语感来说选择A。一定要从语法上解释，我可能不是太专业。。。好久没看英语语法了。

如果用that，do前面就不是一个名词，而是一个完整句子。这整句话就成了“you have done that might do harm to other people"，句子里面有两个动词（两个do），不合语法。
如果用What，这个句子的主语就是what，而you have do...

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诶，凭语感来说选择A。一定要从语法上解释，我可能不是太专业。。。好久没看英语语法了。

如果用that，do前面就不是一个名词，而是一个完整句子。这整句话就成了“you have done that might do harm to other people"，句子里面有两个动词（两个do），不合语法。
如果用What，这个句子的主语就是what，而you have done就是what的定语，do harm中的“do"是真正的谓语，这样句子在语法上才是正确的。

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