— 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

試題分析：句意：—我昨天早上打電話給你。一個(gè)女孩接的，但我沒聽出是誰的聲音。—哦，一定是我的小妹妹。她那會(huì)正在我的房間。A. 一定是，肯定推測；B. 本應(yīng)該；C. 可能是；D. 也許是。結(jié)合語境，選A。
考點(diǎn): 考查情態(tài)動(dòng)詞表推測的用法。
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