— 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 been B．should have been C．could have been D．may have been

A

解析試題分析：句意：—我昨天早上打電話給你。一個(gè)女孩接的，但我沒(méi)聽(tīng)出是誰(shuí)的聲音�！�，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(cè)；B. 本應(yīng)該；C. 可能是；D. 也許是。結(jié)合語(yǔ)境，選A。
考點(diǎn): 考查情態(tài)動(dòng)詞表推測(cè)的用法。

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