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
网友回答
(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。