We are kept what is happening in the world by reading newspapers and watching TV.A. to i

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A. to inform
B. to be informed about
C. informing of
(答案→)D. informed of
解析：考查过去分词做宾语补足语：读报和看电视可以让我们了解世界上所发生的事情。keep 后面可以宾语+宾语补足语，因为we和inform of是被动关系，用过去分词做宾语补足语，所以填 informed of选D。