We played really poorly in the first half.We should ,however

We played really poorly in the first half.We should ,however,feel that wewere very lucky indeed. After all,the cscore is tied.为什麽用 should ?A. would B. could C. should D. might 请详解. 是 表推测 ,怎麽解释? 还是委婉提出自己的建议.? 该怎麽解释?请指点迷津! 不是选择对了,就可以了,到底should 表达什麽用法? 该根别人如何解释,望请大家详细解释,谢谢!the score is tied