试题题干
Jim was not（ ）his maths teacher's explanation of the problem, for he was still puzzled about it.
参考答案
正确答案：
试题解析
本题考查词组辨析。
aware of：意识到，知道；positive about：对...积极，确信；impressed by：留下深刻印象；content with：满足于。
句意：吉姆不满足于数学老师对这个问题的解释，因为他仍然对这个问题感到困惑。故D选项符合题意。