He knows China very well. That is he has good understanding of Chinese history.A. ／；theB.

问题补充：

He knows China very well. That is，he has good understanding of Chinese history.

A. /；the

B. /；/

C. a；a

D. a；/

答案：

A. /；the

B. /；/

C. a；a

(答案→)D. a；/

解析：考查冠词。句中a good understanding of更好的理解……，Chinese history = the history of China。句意：他非常了解中国，也就是说，他对中国历史有很好的理解。