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— 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.
A.must have beenB.should have beenC.could have beenD.may have been
A

试题分析:句意:—我昨天早上打电话给你。一个女孩接的,但我没听出是谁的声音。—哦,一定是我的小妹妹。她那会正在我的房间。A. 一定是,肯定推测;B. 本应该;C. 可能是;D. 也许是。结合语境,选A。
考点: 考查情态动词表推测的用法。
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