He took

【答案】：C
句意：他取了马克·吐温的名字，并在19世纪60年代非常出名。
考查冠词。a和an是不定冠词，修饰可数名词单数，表示泛指一个……；an用于元音音素前；the是定冠词，修饰名词表示特指。第一个空特指“Mark Twain”这个名字，因此用定冠词the；第二个空是固定短语in the 1860s表示“在19世纪60年代”。故选C。

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