We think it most important that _______________(理論與實際相結(jié)合).
答案:theory be combined with practice
解析:be combined with...是固定搭配,意為"與......相結(jié)合"。Be connected with是指"將......連起來",在含義上有所差別。其次,句首用了We think it most important that句型,暗示從句要用虛擬語氣,should可以省略。