摘要：15．Isn’t it time you got down to the papers? A．mark B．be marked C．being marked D．marking 解析:get down to意为“开始.着手 .to是介词.后接名词或动名词.表示“难道没有到你给论文打分的时间吗? 答案:D
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Isn’t it time you got down to________the papers?
A．mark B．be marked
C．being marked D．marking
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Isn't it time you got down to ________ the papers?
[ ]
A．mark
B．be marked
C．being marked
D．marking