Question

— 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

Answer 1

A

試題分析：句意：—昨天上午我給你打電話。一個女孩的回答，但我沒聽出誰的聲音�！�哦，那一定是我妹妹。她那一刻正在我的房間里。情態(tài)動詞加動詞的現(xiàn)在完成式形式，表示對過去的推測。A. must have been表示一定做了某事。用于肯定推測；B. should have been 本應(yīng)該，表示應(yīng)該做而沒有做某事。C. could have been用于肯定句時，表示可能做了某事。更常用于否定推測；D. may have been 可能做過某事。表示可能性很小。結(jié)合語境判斷，A最佳。