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I____ asleep because it took me a long time to realize that the telephone was ringing.
A.could have fallenB.should have fallen
C.must have fallenD.mustn’t have fallen

答案
C
解析
考查虚拟语气。句意;我肯定是睡着了,因为用了很长时间我猜意识到电话铃一直在响。“must+have+done”表示对过去事情的肯定推测,译成“一定做过某事”。故选C。
核心考点
试题【I____ asleep because it took me a long time to realize that the telephone was ri】;主要考察你对虚拟语气等知识点的理解。[详细]
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