It's useless后面是doing还是to do?

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It's useless后面是doing还是to do?
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It's useless后面是doing还是to do?
It's useless后面是doing还是to do?

It's useless后面是doing还是to do?
只有表示“正在做某事”的时候才用doing,如果没有任何这个意思的话,就用 to do,不管这件事情已经完成了做出评价还是没有做

to do

Doing,和It is no use doing一样的…

两个都一样咯