问题描述：
| Sugar is not an important element in bread, but flour is _______. |
| [ ] |
| A. unique B. essential C. natural D. adequate |
考点提示：形容词
最佳答案： | B |
Sugar is not an important element in bread, but flour is _______. [ ]A. uniqueB. essential C. natura
Sugar is not an important element in bread, but flour is _______. [ ]A. uniqueB. essential C. natura
最佳答案： 