I really can’t thank you enough sir. —.A. That’s the most I could doB. I’m glad to have b

问题补充：

I really can’t thank you enough， sir. —.

A. That’s the most I could do

B. I’m glad to have been of help

C. No problem

D. With pleasure

答案：

A. That’s the most I could do

(答案→)B. I’m glad to have been of help

C. No problem

D. With pleasure

解析：句意：上文，先生，我再怎样感谢你都不为过。下文，我很高兴提供了帮助。That’s the most I could do那是我所能做的最多的 I’m glad to have been of help我很高兴提供了帮助 No problem没事儿 With pleasure高兴地，选B。