When she was in trouble I did what I could to help her my help she wrote me a letter of

问题补充：

When she was in trouble, I did what I could to help her． my help, she wrote me a letter of thanks．

A. In honor of

B. In case of

C. In terms of

D. In return for

答案：

A. In honor of

B. In case of

C. In terms of

(答案→)D. In return for

解析： 略