To the teacher's surprise, the boy had no ____ out the ____ maths problem. [ ]A. difficulty
问题描述：
| To the teacher's surprise, the boy had no ____ out the ____ maths problem. |
| [ ] |
| A. difficulty to work; difficult B. difficult working; difficulty C. difficulty working; difficult D. difficulty in working; difficulty |
考点提示：形容词,动词短语
最佳答案： | C |
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