How Native Americans developed corn is a puzzling, for no wild com has ever been discovered.

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问题 How Native Americans developed corn is a puzzling, for no wild com has ever been discovered.

选项

答案puzzling—puzzle

解析译文：土著美国人如何种植玉米是个谜，因为至今还没有发现野生的玉米。
分析：考查词性。冠词a后应该加可数名词单数，puzzling是形容词，应改为名词puzzle。

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