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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

解析試題分析：get down to 后接名詞或動(dòng)名詞，意思是著手做某事，所以選C。
考點(diǎn)：固定短語的考查
點(diǎn)評(píng)：對(duì)于固定短語的具體用法，平時(shí)要多歸納、總結(jié)和記憶。

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