Some students are seriously ill and they can't            class for several days. [ ]

A. give

B. attend

C. make

D. assume

小明参加知识竞赛时，主持人出了一道题：“‘一战’中，被称为‘绞肉机’‘屠宰场’的最残酷的战役是什么战役”请帮小明找出正确答案。______

A．马恩河战役

B．索姆河战役

C．凡尔登战役

D．日德兰海战