...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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... get off离开; 动身 be busy doing sth忙于(做)... pick up拾起, 捡起; 抬起 ...
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做完某事 be busy doing sth. 忙于干某事 go on doing sth. 继续干某事 .
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... be busy with 忙于... be busy doing sth 忙于做... by bus /car / plane 乘公共汽车/汽车/飞机 ...
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playing be busy doing sth 忙于做某事
be busy doing sth sth 忙于
doing be busy doing sth 忙于干某事
be busy in doing sth 忙于做某事
be kept busy doing sth 被迫忙于
be e busy doing sth 忙于
Be busy doing sth.
的意思都是“忙于做某事”。
youdao
Her mother is busy cooking in the kitchen. be busy doing sth.
忙着做某事（她的母亲正在厨房忙着做饭。）
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