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问题: 有关于非谓语动词26

The guards _____ there worked round the clock to
keep watch over the building.
A.stationing B.to be stationing C.to be stationed D.stationed
要详细的和思路

解答:

选D.
station派驻(常用被动),排除A.B
非谓语动词作The guards的后置定语,被派驻的保安人员。
答案C to be done的形式表示将发生的被动动作,根据后面的worked可知是已经被派驻的。排除D.