thousands of Chinese students Chuck has vast experience in the Chinese class.A. Having ta

问题补充：

thousands of Chinese students，Chuck has vast experience in the Chinese class.

A. Having taught

B. Taught

C. Teaching

D. To have taught

答案：

(答案→)A. Having taught

B. Taught

C. Teaching

D. To have taught

解析：考查非谓语动词作状语。Chuck与teach之间是主动关系，并且前面粉刺的动作发生在谓语动词之前，故用现在分词的完成时，句意：查克教了成千上万的中国学生之后，在中国的课堂上他有丰富的经验。所以选A。