—How tired I am! I can’t climb any further Mom.— Helen. You can do it!A. No problemB. Th

问题补充：

—How tired I am! I can’t climb any further, Mom.

—, Helen. You can do it!

A. No problem

B. That’s OK

C. Come on

D. Well done

答案：

A. No problem

B. That’s OK

(答案→)C. Come on

D. Well done

解析：No problem没问题；That’s OK 那好吧；Come on开始吧，来吧；Well done做的不错。句意：我是多么累啊！妈妈，我再也不能爬了。联系下文，海伦，你能做到的。可知选C最符合语境。