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    —You may find the key to the math problem on page 107．
    —Ah, it's so simple． I wonder why I _       of that．

    A．hadn't thought B．haven't thought
    C．didn't think D．wasn't thinking

    C

    解析试题分析：考查时态：句意：--你可以在107页找到数学问题的答案。--哦，是这么简单，我当时没想到这句应该用过去式，A表示过去的过去B表示到现在没想到，D是过去没有在想。选C。
    考点：考查时态

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