问题描述：
| This kind of exercise is most _____, and therefore is a good test of you students' ability. |
| [ ] |
| A. surprising B. encouraging C. exciting D. challenging |
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最佳答案：
| D |
最佳答案：
题目：This kind of exercise is most _____, and therefore is a good test of you students' ability.
最佳答案：
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