问题补充：
It is important that we with all that in the struggle.
A. should unite, be united
B. would unite, can be united
C. unite , can be united
D. should unite, could unite
答案：
A. should unite, be united
B. would unite, can be united
(答案→)C. unite , can be united
D. should unite, could unite
解析：It is important that后跟从句用虚拟语气，（should ）do结构，句意：在战斗当中我们应该团结一切可以被团结的是非常重要的。根据语境应选C。
