set off to do还是doing?

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setofftodo还是doing?setofftodo还是doing?setofftodo还是doing?off是介词所以setoffdoingsthsetoff是动词+副词构成的短语动词off在这

set off to do还是doing?
set off to do还是doing?

set off to do还是doing?
off 是介词 所以set of f doing sth

set off是动词+副词构成的短语动词
off 在这里是副词不是介词,
接to do表示目的

set off to do
出发去做