be busy doing sth等于什么这句话The CEO is busy signing files.等于什么

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be busy doing sth等于什么这句话The CEO is busy signing files.等于什么
be busy doing sth等于什么
这句话The CEO is busy signing files.等于什么

be busy doing sth等于什么这句话The CEO is busy signing files.等于什么
be busy doing sth.=be busy to do sth.
望楼主采纳!我们学过的

be busy with sth和be busy to do sth,一般还是用前面那个,绝对准确,我英语六级,学过这个词组