题目内容
11.What is the theory basedon?分析 这条理论以什么为基础?
解答 3.on.根据"is(be)based ___"可知,此空考查词组"be based on",意为"以…为基础".
点评 语法填空题要瞻前顾后找关键词,纯空格题可考虑冠词、代词、介词、连词.
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