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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 家長們對孩子做這么多家庭作業(yè)的必要性存有疑問．

解答 C 考查固定句型．there be表示"有"在此結構中的be根據所表達的句意需要，可用exist，live，stand，remain等代替，根據句意"存有疑問"，所以答案選C．

點評 對于英語中固定句型的考查，需要考生在平時的學習中積累句型，掌握句型，根據句意和句子結構的要求選擇合適的句型，然后選出正確的答案．

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