We need to think outside of box we are to e up with something really new.
A. so that
B. as long as
C. once
D. if
网友回答
A. so that
B. as long as
C. once
(答案→)D. if
解析： if在本题中引导条件句。think outside of box表示“跳出惯性思维来思考问题”。e up with想出主意、办法或某个问题的解决方案。句意为：如果我们要真正想出一些新的主意就要跳出惯性思维去思考。