what did he tell his wife that he wished to do?A.此句中,that作何解释?

这个解释是错的！！！！理解错了，怎么能给学生讲清楚？？？这个句子的陈述形式应该是：he told his wife that what he wished to do. that引导的是宾语从句，而what在宾语从句里充当的是do的宾语。宾语从句中有个知识点是：有10种情况不能省略that，这个（宾语从句的主语是非谓语动词或主语，宾语从句时），是其中一种！！！！！

he told his wife what he wished to do. tell sb. to do tell sb. sth. tell sb. that从句 这里是末项 所以 he told his wife that

把这句话变成陈述句形式 he told his wife what that he wished to do.
这样很明了了吧,
what 是先行词.
that 引导的是一个定语从句