We need to how we are going to get there.A. work onB. work upC. work outD. work at

网友回答

A. work on
B. work up
(答案→)C. work out
D. work at
解析：考查短语辨析。work on 从事，work up 刺激，激起，work out 解决，计算出，work at在什么上班，从事，句意：我们必须计划好怎样到那。所以选C。