people make a promise will do whatever they can (do).为什么可以省略do.
人气：148 ℃ 时间：2020-04-21 11:38:45
解答
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
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