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【题目】Tom had learned more than 100 words_______ the age of five

A. byB. aboutC. atD. of

【答案】A

【解析】

句意:Tom到五岁的时候就已经学会了100多个单词了。by时候;about关于,大约;at岁的时候;of…的。根据had learned可知,这是过去完成时,时间状语应用by+过去的时间,故选A

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