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The door is open but nobody is in. Mary_...

The door is open but nobody is in. Mary______have forgotten to lock the door.

A. should       B. must      C. would        D. could

 

B 【解析】 试题分析:考查情态动词。 句意为:门开着但是没人在里面,玛丽一定是忘了锁门了。本题考查的是情态动词的用法。must have +过去分词表示对过去事实的肯定猜测,符合题意。补充:should have +过去分词表示本来应该做某事,而实没做。could have +过去分词,表示对过去事情的假设,表示本来能够做某事而实际却没有做。would + have +过去分词,表示对过去事情的假设,本来会做。故选B。 考点:考查情态动词  
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