Mr.Smithissobusy------hisofficeworkthathespendslittletimelookingafterhischildren.AwithBin
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题目内容：
Mr.Smith is so busy------his office work that he spends little time looking after his children.
A with B in
优质解答
A be busy with sth.词组表示忙于某事,忙着做某事.
busy还有相似词组be busy doing
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