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一道初一英语单选题Lily was so ___looking at the picture that she forg

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一道初一英语单选题
Lily was so ___looking at the picture that she forgot the time.
A,carefully
B,careful
C,busily
D,busy
我觉得选D (be busy doing sth)
可是标准答案是选B,
不是很了解
是我错了还是标准答案错了?
难道有be careful doing sth这种句型吗
有这个结构so that 那么根据据意:lily很认真地看着那幅画,以至于忘记了时间如果是忙于的话,是不是应该是pictures呢?