though he was angry,he couldn't help 改为同义句 --he was,he could

Angry as
as 引导让步句时,注意要表语前置
再问： however angry 不行吗？
再答： 讲得通，意即“不管他多么生气”= No matter how angry he was. 但指具体的某一回， 最好用 Angry as he was
再问： 那谢谢啦