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When Mark Twain was young,he did___he could___.

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When Mark Twain was young,he did___he could___.
A.all;earn his living B.what;earn his living
C.all;to earn his living D.what;earning his living
选C
当马克吐温年轻的时候,他做所能做的一切事情来谋生.
all 是先行词,(that)he could 是定语从句.to earn his living 是动词不定式做目的状语.
再问: 第一空可以使用what吗
再答: 可以用what,那就成了what 引导宾语从句。 后一空必须用动词不定式。