问题描述：
| The little boy was ____by the ____ sound. |
| [ ] |
| A. to frighten; frightening B. frightened; frightening C. frightened; fright D. frightening; fright |
考点提示：形容词
最佳答案：
| B |
最佳答案：
题目：The little boy was ____by the ____ sound. [ ]A. to frighten; frightening B. frightened; frightening
最佳答案：
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