问题描述：
He didn't live up to ----- his parants had expected of him.0A all that B what这两个答案是否都可以？是 all that 不是 sll that
问题解答：
这句话应该是说他没有辜负父母对他所有的期望两个答案都可以，如果是all that就是以定语从句。用what就是名词性从句，一般名词性从句都可以转化成定语从句what就相当于the thing that本质和all that一样的
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