he have to do (that/what)his mother told him
问题描述：
he have to do (that/what)his mother told him
答
told(tell过去式） sb sth 借双宾语！
his mother told him缺少一个宾语
从句缺什么就补什么
所以要填写what
如果不缺成分就that
意思就是他必须做他妈妈和他说的事！
比如That he passed the English test is true这里的主语从句 That he passed the English test 不缺任何成分 就不需要用what 用that
Do you know what he has said 这里的宾语从句缺少他说的内容 所以要用what!
答
what
这个考查 what 引导的宾语从句，what his mother told him 作do的宾语。
答
He has to do what his mother told him.
这个考查 what 引导的宾语从句,what his mother told him 作do的宾语.
答
what
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