Question

I told Sally how to get there, but perhaps I ______ for her.

1. A.
   had to write it out
2. B.
   must have written it out
3. C.
   should have written it out
4. D.
   need to have written it out

Answer 1

C
试题分析：考查情态动词+完成式的用法：句意：我告诉Sally怎么到这儿，但是可能我应该把它写下来。本应该做而没做should have done，must have done过去一定做了，need 后面直接接have done，没有to，选C。
考点：考查情态动词+完成式的用法
点评：情态动词无论是表达“推测和可能性”，还是表达“虚拟”这一概念，只要是对过去已经发生的事情进行描述，一律用“情态动词+have done”这一结构；对现在或将来的事情进行描述，用“情态动词+动词或系动词原形”。