...B解析分析：少量的“be+形容词”后面的动词要用doing形式，常见的有be busy doing sth(忙于做某事)，be worth doing(值得做)。(延伸)be busy with sth(忙于做某事)和be busy doing意思相同。
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(延伸)be busy with sth(忙于做某事)和be busy doing意思相同。介词后面的动词要用doing结构，但此处已经有了be busy doing的形式，所以不会出现be busy with doing的...
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... from door to door 挨家挨户 be busy with / doing sth. 忙于做某事 get ready for 为……作准备 ...
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从事于或忙于做某事 do
忙于做某事/动词词组 be busy with sth./be busy doing sth ; be engaged in sth./doing
太忙于做某事 up to one's neck be
忙于/忙于做某事 be busy with sth/doing sth
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