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  3. —I phoned you yesterday morning. A girl answered, but I didn’ t recognize the voice. —Oh, it___________my younger sister. She wa

—I phoned you yesterday morning. A girl answered, but I didn’ t recognize the voice. —Oh, it___________my younger sister. She wa

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问题 —I phoned you yesterday morning. A girl answered, but I didn’ t recognize the voice.
—Oh, it___________my younger sister. She was in my room at that moment.
选项 A、must have been
B、should have been
C、could have been
D、may have been
答案A
解析 must have done一定做过……，表示对过去发生事情的肯定推测，语气较强；should have done本来应做……，表示过去本应该做某事却没有做；could have done本来能够做……，表示过去本能做某事而没有做；may have done可能做过……，表示对过去发生事情可能性的推测。根据句意可知，此处表达的是肯定的推测，所以空处应用must have been。故选A。
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