Some seemingly harmless blogs might become harmful when on the Internet by millions of pe

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A. to read
B. reading
(答案→)C. read
D. being read
解析：考查省略句。当状语从句的主语与本句主语一致，且句中含有be动词的时候，可以把状语从句的主语和be动词一起省略。本题在when后面省略了Some seemingly harmless blogs are；句意：当一些似乎无害的博客被很多人阅读的时候，这些博客也会有伤害了。故C正确。