题目内容
12．Hedidn't realize （not realize） the importance of learning English until two years ago．分析 直到两年前他才意识到学习英语的重要性．
解答 答案：didn't realize．
根据He--（not realize） the importance of learning English until two years ago，可知直到两年前他才意识到学习英语的重要性，这里two years ago是个过去的时间，所以时态应该用一般过去时，realize是个实意动词，变成否定句应该加助动词did．故填didn't realize．
点评 考查单词填空．准确的翻译句意及分析句子结构、时态、固定搭配等是关键，然后再用合适的形式完成句子．
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