题目内容
12．-When did you bbegin to study English？--Seven years ago．
分析 --你什么时候开始学习英语的？
--七年以前．
解答 答案：begin．
根据"to study"以及首字母b，可知要用begin，begin to do sth．开始做某事，这是一个特殊疑问句，前面有助动词did，所以后面要用动词原形，故填begin．
点评 首先要仔细阅读句子，分析与空格有关的信息，结合给出的首字母，就可以确定正确答案．
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