Thanks a lot for me to join you.A. askB. to askC. askingD. asks

问题补充：

Thanks a lot for me to join you.

A. ask

B. to ask

C. asking

D. asks

答案：

A. ask

B. to ask

(答案→)C. asking

D. asks

解析：句意：谢谢你叫我加入你们。Thanks for doing sth.谢谢做某事，后接动词ing形式，故选C。