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题目
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All of the flowers now raised here have developed from those _____ in the forest.    
A.once they grewB.they grew once
C.that once grewD.once grew

答案
C
解析
考查定语从句的关系词的用法。分析句意和句子结构可知those之后是个定语从句,those相当于those flowers,是先行词,因为是生长在森林里的(野)花,grew和关系代词之间是主谓关系,因此that不能省。once在此表示“过去曾”,常与过去时连用,还可表示“每次”,引导从句时表示条件,翻译成“一旦”。
核心考点
试题【All of the flowers now raised here have developed from those _____ in the forest】;主要考察你对句法等知识点的理解。[详细]
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