Question

--Thank you very much ________ helping me to repair my old computer.

--That's all right. Thanks ________ your letter, I can come in time and repair it for you.

[　　]

A．for; for

B．to; to

C．to; for

D．for; to

Answer 1

答案：D
解析：

thank sb. for (doing) sth.意为“感谢某人做了某事”；thank to意为“由于，因为”，是固定短语。