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---You may find the key to the maths problem on page 107.
---Ah, it’s so simple. I wonder why I ________ of that.
A.didn’t think B.haven’t thoughtC.wasn’t thinkingD.hadn’t thought
A
考查时态.根据题意,在107页你能找到答题的关键.——啊,这么简单。我想知道我为什么没有想到那点。可知从句说的是过去发生的事情。I是 从句主语,用主动语态过去时态,选A。
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