新概念3第十课的课后作业Supplementary Written Exercises 第四题为什么选b?题目是:____were 1316 passengers and a crew of 891 . a. On her board b. On board her c. Boarding her d. On boarding her请过路高人详细指教。谢谢猫又兄。但这里,选项里是'her',不是'she'.这有如何解释?