Sam is a very good man. He always tries best to help others. A. heB. himC. hisD. he’s

问题补充：

Sam is a very good man. He always tries best to help others.

A. he

B. him

C. his

D. he’s

答案：

A. he

B. him

(答案→)C. his

D. he’s

解析：此题重点考查固定结构try one’s best to do sth表示尽某人最大努力做某事