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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

【解析】

试题分析:考查情态动词+have done的用法:句意是:“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C。

考点:考查情态动词+have done的用法

点评:情态动词+have done可以表示推测和虚拟:“must+have+done”表示对过去事情的肯定推测,译成“一定做过某事”,该结构只用于肯定句。“can't+have+done”表示对过去事情的否定推测,译成“不可能做过某事”。 “may+have+done”表示对发生过的事情的推测,意思是“可能已经”或“也许已经”,用于肯定句中。 “could+have+done”是虚拟语气,表示对过去事情的假设,意思是本来能够做某事而没有做。 “would+have+done”虚拟语气,表示对过去事情的假设,意思是“本来会做”。

 

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