doing
be busy to do还是doing
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是be busy doing sth 还是 be busy with doing sth
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be busy doing 是不是省略了in 应该是 be busy in doing 还有 上面两个跟be busy
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英语翻译allow sb.to do sth.ask sb.to do sth.be busy doing sth.be
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be known +to do 还是doing?