Theboyisveryyoung,butheknowsmuch

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The boy is very young, but he knows much _______ about computers.

A. knowledge B. skills C. inventors D. future

A 考查名词。根据句意“这个男孩虽然小但他对电脑知识了解很多”，又因much修饰不可数名词，故选A。