---Youmayfindthekeytotheproblematthebackofthebook.---Ah,it'ssos

发布时间：2020-08-06 18:43:27

---You may find the key to the problem at the back of the book.---Ah, it's so simple! I wonder why I ______ out that.A.had't workedB.haven't workedC.didn't workD.wouldn't work

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C解析由回答可知，对方在说话时已知道题目的解法，但说话前不知道。用过去时表示“怎么当初没想到呢？”
以上问题属网友观点，不代表本站立场，仅供参考！