My brother is busy ----- ----- ------我弟弟正忙着做家庭作业,空格上填什么

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My brother is busy ----- ----- ------我弟弟正忙着做家庭作业,空格上填什么
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My brother is busy ----- ----- ------我弟弟正忙着做家庭作业,空格上填什么
My brother is busy ----- ----- ------
我弟弟正忙着做家庭作业,空格上填什么

My brother is busy ----- ----- ------我弟弟正忙着做家庭作业,空格上填什么
with his homework.
或是:with doing his homework.
这里考查的是"be busy with doing sth"这个短语的用法