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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 thoughtB.haven't thoughtC.didn't thinkD.wasn't thinking
C

试题分析:考查时态。句意:—你在107页上可以找到这个数学题的答案。—啊!太简单了!我想知道为什么我就想不起来这个答案呢?根据句意说明我没有想起这个答案是过去的事情,故使用一般过去时。故C正确。
点评:英语中的时态主要由动词的形式决定,因此在学习英语时态时,要注意分析动词形式及具体语境,想象在那个特定的时间动作所发生的背景,这个动作是经常性动作、一般性动作、进行性动作、完成性动作还是将要发生的动作。
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