Isn't it time you got down to        the papers?
A．markB．be markedC．being markedD．marking
D

試題分析：考查動名詞：句意為：還不到你著手批改這些試卷的時候嗎？ get down to意為“開始做某事，開始認(rèn)真注意/對待某事”，to是介詞，其后接名詞、代詞或動名詞；you與mark之間存在邏輯上的主謂關(guān)系，故應(yīng)該用主動形式。選D。
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