句型转换:Can't you see he is busy with his homework?Can't you see he is _____ _____ his homework?Can't you see he is busy with his homework?Can't you see he is _____ _____ his homework?我觉得此处应该是填busying on或busying in,可是

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句型转换:Can''tyouseeheisbusywithhishomework?Can''tyouseeheis__________hishomework?Can''tyouseeheisbusywith

句型转换:Can't you see he is busy with his homework?Can't you see he is _____ _____ his homework?Can't you see he is busy with his homework?Can't you see he is _____ _____ his homework?我觉得此处应该是填busying on或busying in,可是
句型转换:Can't you see he is busy with his homework?Can't you see he is _____ _____ his homework?
Can't you see he is busy with his homework?
Can't you see he is _____ _____ his homework?
我觉得此处应该是填busying on或busying in,可是两者有什么区别呢?

句型转换:Can't you see he is busy with his homework?Can't you see he is _____ _____ his homework?Can't you see he is busy with his homework?Can't you see he is _____ _____ his homework?我觉得此处应该是填busying on或busying in,可是
busy doing