tim has been a doctor for many years so he is an

问题补充：

tim has been a doctor for many years ,so he is an

答案：

c experienced

experienced [ikspiəriənst]

adj.老练的,熟练的；富有经验的

======以下答案可供参考======

供参考答案1:

c有经验的 a 期望的b 开心的d 表达的