Thanks to help from his teachers and classmates he has made rapid progress in his studi

问题补充：

Thanks to help from his teachers and classmates, he has made rapid progress in his studies.

A. 不填；a

B. the; 不填

C. the; a

D. a; the

答案：

A. 不填；a

(答案→)B. the; 不填

C. the; a

D. a; the

解析：考查冠词：第一空是填the，特指是来自老师和同学的帮忙，第二空不填，因为progress，是不可数名词，句意：多亏了老师同学的帮助，他的学习取得了很大的进步。选B。