Thank you Mr. Chen. I’m wondering how to the great help you gave me during my study this

问题补充：

Thank you, Mr. Chen. I’m wondering how to the great help you gave me during my study this year.

A. pay back

B. keep back

C. hold back

D. look back

答案：

(答案→)A. pay back

B. keep back

C. hold back

D. look back

解析：短语辨析。 A. 偿还；报答 B.留下；隐瞒 C.隐瞒；阻止D. 回顾。句意：谢谢你，陈先生。我想知道我如何报答你这些年我留学期间给我的巨大帮助。故选A。