I ________ asleep because it took me a long time to realize that the telephone was ringing.　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　
A．could fall B．need have fallenC．must have fallen 　 D．may fall
C
考查情態(tài)動(dòng)詞表示推測的用法。must have done 表示對過去事情肯定的推測，句意：我當(dāng)時(shí)一定是睡著了，因?yàn)榛宋液瞄L一段時(shí)間才意識(shí)到電話正在響。故選C。
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