--What else must we pay attention to ___...

--What else must we pay attention to ____ our school clean?

--We must not throw any litter onto the ground.

A. keeping B. kept C. keep D. to keep

D 【解析】试题分析：句意：--为了保持我们学校干净，我们应该注意其他的什么事项?—我们不可以在地上乱扔垃圾。这里pay attention to表示注意，留心后加名词、代词、动名词，此句中what作pay attention to的宾语。在这里缺少目的状语，故选D。考点：考查非谓语动词。

考点分析：

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