be busy doing的同义短语
问题描述：
be busy doing的同义短语
The English girl can speak chinese well.=The English girl is ______ ______ speak chinese well.
当我离开家时我忘记了钥匙.
I______ my keys ______ when I_______ my home.
好的追加,速度速度!
答
working on
left home left