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5.Among the parents            a certain doubt as to the necessity of children's doing so much homework.(  )
A.it existedB.who existedC.there existedD.they existed

分析 家长们对孩子做这么多家庭作业的必要性存有疑问.

解答 C 考查固定句型.there be表示"有"在此结构中的be根据所表达的句意需要,可用exist,live,stand,remain等代替,根据句意"存有疑问",所以答案选C.

点评 对于英语中固定句型的考查,需要考生在平时的学习中积累句型,掌握句型,根据句意和句子结构的要求选择合适的句型,然后选出正确的答案.

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