問題詳情：
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
【回答】
【解析】選C。“ought to/should have+過去分詞”表示後悔當初該做但卻沒做某事。後半句句意：“……也許我本該把地址詳細寫給她的。”
知識點：虛擬語氣與情態動詞
題型：選擇題
