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i did (that/what) i could (help/to help) others.这两个怎么选/为什么?

题目详情
i did (that/what) i could (help/to help) others.这两个怎么选/为什么?
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答案和解析
I did (what I could) to help others .
前面的what 引导I could
后面的 to help 表目的