从所给的四个选项中选择最佳答案 The maths problem is very difficult, for they have tried . [ ] A
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从所给的四个选项中选择最佳答案
The maths problem is very difficult, for they have tried ______.
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A.every means possible
B.every mean possible
C.possible every means
D.every possible mean
试题答案
答案:A