从所给的四个选项中选择最佳答案 This problem is hard ． [ ] A．to working out B．to work out C．to b
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从所给的四个选项中选择最佳答案
This problem is hard ______．
[]
A．to working outB．to work out
C．to be worked out D．working out
试题答案
答案：B
从所给的四个选项中选择最佳答案
This problem is hard ______．
[]
A．to working outB．to work out
C．to be worked out D．working out
答案：B