The doctor was busy ____ on the boy at that time.
The doctor was busy ____ on the boy at that time.
B.to operate D.operating
B为什么错了?
B.to operate D.operating
B为什么错了?
英语人气：989 ℃时间：2020-03-10 02:32:02
优质解答
be busy doing sth是固定词组
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