We’ve published large quantities of books. This year we’ve published three million copies.

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A. only
B. just
(答案→)C. alone
D. simply
解析：考查副词： this year alone“仅仅今年(就)……”，alone作副词“仅仅，只有”，句意：我们已经出版了大量的书，仅今年就出版了三百万(册/本)。又如：Man alone has the gift of speech.只有人类有语言的天赋。only表示“仅仅”时，原则上放在被修饰的词、短语或句子前面，如：He was only five years old.他只有5岁。just表示“仅仅”时用法：He is just a child.他只是个孩子。merely同only：He merely wants to know the truth.他只不过想知道事情真相。选C。