Jack Chan is very modest. He never .A. shows offB. shows onC. show offD. show on

问题补充：

Jack Chan is very modest. He never .

A. shows off

B. shows on

C. show off

D. show on

答案：

(答案→)A. shows off

B. shows on

C. show off

D. show on

解析：A “成龙很谦虚，他从不炫耀自己。”故空白处意为“炫耀”，即show off ；he是第三人称，故谓语用单数，选A。