问题补充：
—He should have been punished for the serious mistake.
— , but he escaped it.
A. So should he
B. So he was
C. So he should
D. So he has
答案：
A. So should he
(答案→)B. So he was
C. So he should
D. So he has
解析：这题考查so+主语+助动词/be动词/情态动词，表示“也是’,句意是;--他本该为这个受惩罚，--是的，但是他逃脱了。选B。
