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 -你可能會在107頁找到這道數(shù)學(xué)題的答案．
-啊，太簡單了，我不明白為什么我就沒想到這點呢．

解答 答案：C
分析句意可知，此處表示在別人告訴"我"可能會在107頁找到這道數(shù)學(xué)題的答案之前，"我"沒想到這點；因此此處強調(diào)的是發(fā)生在過去某一時間的動作，并不強調(diào)對現(xiàn)在造成的影響；應(yīng)使用一般過去時，故選C．

點評 本題考查了一般過去時的用法；做本題時，應(yīng)注意區(qū)分現(xiàn)在完成時與一般過去時的意義及用法區(qū)別．

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