题目内容
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If I had known more about first aid, I could have helped him.
______ ______ ______ ______ first aid, I couldn't help him.
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天天向上一本好卷系列答案小学生10分钟应用题系列答案题目内容
句型转换
If I had known more about first aid, I could have helped him.
______ ______ ______ ______ first aid, I couldn't help him.
天天向上一本好卷系列答案小学生10分钟应用题系列答案