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(huì)在107頁(yè)找到這道數(shù)學(xué)題的答案．
-啊，太簡(jiǎn)單了，我不明白為什么我就沒(méi)想到這點(diǎn)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(huì)在107頁(yè)找到這道數(shù)學(xué)題的答案之前，"我"沒(méi)想到這點(diǎn)；因此此處強(qiáng)調(diào)的是發(fā)生在過(guò)去某一時(shí)間的動(dòng)作，并不強(qiáng)調(diào)對(duì)現(xiàn)在造成的影響；應(yīng)使用一般過(guò)去時(shí)，故選C．

點(diǎn)評(píng) 本題考查了一般過(guò)去時(shí)的用法；做本題時(shí)，應(yīng)注意區(qū)分現(xiàn)在完成時(shí)與一般過(guò)去時(shí)的意義及用法區(qū)別．

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