C While 尽管（表转折之意）
翻译：尽管学生们觉得士兵的想法很有意思,但实际操作很难.
as:和...一样,当作,依照,以...身份
when:当...的时候,那时,既然
despite +名词/动名词：
如：I failed the test despite studying all night.
尽管整夜学习,我还是考试不及格.
His father-in-law lives on despite the car accident.
尽管出了车祸,他的岳父仍然活下来.
All the people on the ship were in safety despite the storm.
虽然遇到风暴,船上所有的人都安然无恙.