20．______a certain doubt among the parents as to the necessity of children's doing so much home-work．（　　）
A．There existedB．There hadC．It existedD．It had

分析 父母對孩子做這么多家庭作業(yè)的必要性存在疑問．

解答 A 考查固定句型．there be句型本身就是完全倒裝句．其中be可以換成其他動詞如；there lives/lived…；there lies/lay…；there stands/stood；there exists/existed等等，用現(xiàn)在時還是過去時是根據(jù)句子的時態(tài)要求而定的．根據(jù)句意：父母對孩子做這么多家庭作業(yè)的必要性存在疑問．所以答案選A．

點評 "There be"是英語中最常見的又是非常重要的句型，意思是"有"，表示"人或事物的存在"或"某地有某物"，不管在口語中還是在書面語中，there be 句型的使用頻率是很高的．但是對there be句型的多變的特點及其特殊結(jié)構(gòu)的復(fù)雜性的了解，是解答there be 句型的關(guān)鍵．

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