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【单选题】

proFEssor smith, Along with his AssistAnts, ______on thE projECt DAy AnD night to mEEt thE DEADlinE.
A．work
B．working
C．is working
D．ArE working

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根据网考网移动考试中心的统计，该试题：

7%的考友选择了A选项

20%的考友选择了B选项

71%的考友选择了C选项

2%的考友选择了D选项

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