Thank you for me with this heavy box.　　　- You are welcome.A. helpingB. to helpC. h

问题补充：

--- Thank you for me with this heavy box.

--- You are welcome.

A. helping

B. to help

C. help

D. helped

答案：

(答案→)A. helping

B. to help

C. help

D. helped

解析： for后面一般接名词或动名词表示目的原因等，所以选A.