问题描述：
| Where have you been all these days? We are very _____ about your safety. |
| [ ] |
| A. interested B. frightened C. surprised D. concerned |
考点提示：形容词
最佳答案： | D |
Where have you been all these days? We are very _____ about your safety. [ ]A. interested B. frighte
Where have you been all these days? We are very _____ about your safety. [ ]A. interested B. frighte
最佳答案： 