— Why was the summit (高峰会谈) held?   

— ______.

A. Deal with the global warming.               B. To deal with the global warming.

C. Dealing with the global warming.    D. To have dealt with the global warming.

— Why was the summit (高峰会谈) held?   

— ______.

A. Deal with the global warming.               B. To deal with the global warming.

C. Dealing with the global warming.    D. To have dealt with the global warming.

 — Why was the summit (高峰会谈) held?   

— ______.

A. Deal with the global warming.          B. To deal with the global warming.

C. Dealing with the global warming.  D. To have dealt with the global warming.