I told Sally how to get there , but her perhaps I

I told Sally how to get there , but her 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 为什么选A,不选BCD

I told Sally how to get there , but her perhaps I ____for her.
对这道题有两点疑问，一是 but her perhaps I 这里可能有错；二是 就目前看到的这个题干，选C更合适： 我给Sally讲过怎么走，不过也许我（不该只是嘴上讲一讲就完，而是）应该给她写下来。

c 翻译“我告诉过sally 怎么去这里，但是也许我应该给她写出来” 可知说话人现在觉得自己当时应该把地址写给sally，而事实上没有，should have done就表示“本应该作某事而没有做”，是一种虚拟语气的表达，符合题意，其它项 a 表示“不得不”，b表示“一定写过了”。d不表示过去的状态（表示现在或将来应该写出来“

选A的意思是 我告诉了sally怎么到那里,但是她也许不得不把它写下来. (因为她太可能记得住怎么走) I told Sally how to get there , but I perhaps ____for her 如果题目把Her 换成 i , 应该选 C. 意思为 我告诉了sally怎么到那里,但是我应该把它写下来给她. (因为sally不太可能一次就记得住)