问题描述：
| The change was so _____ that we hardly noticed it. |
| [ ] |
| A. actual B. frequent C. gradual D. fluent |
考点提示：形容词
最佳答案：
| C |
最佳答案：
题目：The change was so _____ that we hardly noticed it. [ ]A. actual B. frequent C. gradual D. fluent
最佳答案：
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