题目内容：
So fast ______ that we can hardly imagine its speed. (travel)光传播的速度快到我们难以想象。
参考答案：【答案仅供学习，请勿对照自行用药等】
答案解析：
填空题：So fast ______ that we can hardly imagine its speed. (travel
- 题目分类：英语
- 题目类型：填空题
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光传播的速度快到我们难以想象。
光传播的速度快到我们难以想象。
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