问题描述：
| For our middle school students, some courses are compulsory, while others are ______. |
| [ ] |
| A. flexible B. optional C. impressive D. significant |
考点提示：形容词
最佳答案：
| B |
问题描述：
| For our middle school students, some courses are compulsory, while others are ______. |
| [ ] |
| A. flexible B. optional C. impressive D. significant |
考点提示：形容词
| B |
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