to pick 摘棉花
for为了a;heip pick b;toheippickc; heipedpickd;helpedpicked 四个选项b为什么？？？不定式做目的状语，排除其它几个，因为它们都是谓语动词形式，这样就有两个动作动词了，这在语法里是不允许的。
many people came _our cotton
many people came _our cotton
英语人气：210 ℃时间：2020-02-20 20:16:32
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