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6.-You may find the key to the maths problem on page 107.
-Ah,it's so simple.I wonder why I         of that.(  )
A.hadn't thoughtB.haven't thoughtC.didn't thinkD.wasn't thinking

分析 -你可能会在107页找到这道数学题的答案.
-啊,太简单了,我不明白为什么我就没想到这点呢.

解答 答案:C
分析句意可知,此处表示在别人告诉"我"可能会在107页找到这道数学题的答案之前,"我"没想到这点;因此此处强调的是发生在过去某一时间的动作,并不强调对现在造成的影响;应使用一般过去时,故选C.

点评 本题考查了一般过去时的用法;做本题时,应注意区分现在完成时与一般过去时的意义及用法区别.

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