the student told his teacher ----- had happenedA all what B all thatC thatD which
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B all that
The student told his teacher all that had happened.
=The student told his teacher what had happened.
在宾语从句中,很多时候 what=all that
这里tell sb.sth.=tell sth.to sb.,tell接的是双宾语.sth.直接宾语,sb.间接宾语.故what引导的是名词性从句中的宾语从句,而不是定语从句,故用what不用that,在名词性从句中that不做任何句子成份,也没有任何实际意思,只是all that可以引导宾语从句,但是这里all是代词,that引导定语从句修饰all.
即上面两句是不同的结构：
what引导的是宾语从句.
all是tell的直接宾语,同时that引导的定语从句修饰all,对它做补充说明.
======以下答案可供参考======
供参考答案1:
B供参考答案2:
the student told his teacher ----- had happened
A all what
供参考答案3:
选A供参考答案4:
应该选B要么是what要么是all that，没有all what的说法
供参考答案5:
A all what had happend 表所有曾经发生的
供参考答案6:
A