Mark Twain's best works were produced when（ ）.

Mark Twain's best works were produced when（ ）.
A、he was in the prime of his life
B、he was in London
C、he got married
D、he went to Europe
【正确答案】：A
【题目解析】：马克吐温最好的作品是在他壮年时创作的。