people make a promise will do whatever they can (do).为什么可以省略do.

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people make a promise will do whatever they can (do).为什么可以省略do.
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people make a promise will do whatever they can (do).为什么可以省略do.
people make a promise will do whatever they can (do).为什么可以省略do.

people make a promise will do whatever they can (do).为什么可以省略do.
因为主语的谓语动词是do,这时为了避免重复,其后的从句中情态动词can 后的do 可以省略
另:People 后应该有个who,who make a promise 是定语从句

因为前边已经有do 了, 而且这句话是个病句, 少了一个成分, 要么在people后加who, 要么promise 后加 that they