When I passed this afternoon, I saw a little boy was lying on the grass, his hands _____ under his headA.having crossedB.crossingC.crossedD.to cross
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C解析试题分析：句意：当我今天下午路过的时候，看见一个小男孩躺在草地上，他的双手交叉放在头底下。这里整个句子一个when引导的时间状语，I saw a little boy was lying on the grass这是主句；his hands crossed under his head是独立主格结构，cross one's hands, 交叉手臂；这里his hands与cross之间是被动关系，独立结构sth+done，这里的sth与done之间是被动关系，故选C。考点：考查独立主格结构的用法。