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It is high time, I think, that you got down to ______ something in class.

A.do B.did C.doing D.does

C

解析试题分析:get down to 后接名词或动名词,意思是着手做某事,所以选C。
考点:固定短语的考查
点评:对于固定短语的具体用法,平时要多归纳、总结和记忆。

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