问题: what = all that?
I am pleased with ( ) should be done has already been done.
A what B all that C that all D that what
解释是这样的，what=all that ，此处的what代替了先行词和引导词。这里我有些不明白，what能有这样代替的功能吗？
解答:
what 的确有这样的功能，它可以代替先行词+ that
All that should be done has already been done. 定语从句
= what should be done has already been done. 意思
应该做的已经作了。
参考文献：个人观点
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