问题
选择题
I told Sally how to get here, but perhaps I ____ for her.
A．had to write it out
B．must have written it out
C．should have written it out
D．ought to write it out
答案
C
根据句意“我已经告诉她怎样到那儿，但是或许我应该给她写下来”可知，说话者含有“后悔、遗憾”的意味，应使用“情态动词+完成式”形式，“must+完成式”表示对过去的肯定推测，“should+完成式”才表示虚拟意义。