the students expected there being more reviewing classes before the final exam中,为什么是there bein

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动词expect之后接不定式作宾语补足语,当然也可以接宾语从句.本句既可以说The students expected there to be more reviewing classes before the final exam．,也可以说The students expected there would be more reviewing classes before the final exam．句子译文：“学生们希望在期末考试前有更多的复习课.”