“当妈妈打电话时”用英文怎么说?

问题描述:

“当妈妈打电话时”用英文怎么说?
While my mother was _______ __________ _________ ________,the cat _________ _________ ________ the box
当妈妈打电话时,猫从盒子里跑出来了。

making a phone call(打电话),ran out of (从.跑出来)