---I really don’t know how to thank you enough. --- .A. No problem.B. Think nothing of it.

问题补充：

---I really don’t know how to thank you enough.

--- .

A. No problem.

B. Think nothing of it.

C. With pleasure.

D. Glad to hear that.

答案：

A. No problem.

(答案→)B. Think nothing of it.

C. With pleasure.

D. Glad to hear that.

解析：“我真不知道该怎样感谢你。”“没什么。”A. No problem. 没问题B. Think nothing of it.没什么C. With pleasure. 很乐意做 D. Glad to hear that.很高兴听到这个，答案B。