The Adventures of Huckleberry Finn the USA in the mid 19th century a masterpiece.A. s

问题补充：

The Adventures of Huckleberry Finn, the USA in the mid 19th century, a masterpiece.

A. set in; proves

B. setting in; is proved

C. is set in; proves

D. was set in; is proved

答案：

(答案→)A. set in; proves

B. setting in; is proved

C. is set in; proves

D. was set in; is proved

解析：

A be set in以……为背景，这里用过去分词作定语，修饰The Adventures of Huckleberry Finn，prove证明是，是系动词没有被动语态，因此A项正确。