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

解析試題分析：句意：—昨天上午我給你打電話。一個(gè)女孩的回答，但我沒(méi)聽(tīng)出誰(shuí)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(dòng)詞加動(dòng)詞的現(xiàn)在完成式形式，表示對(duì)過(guò)去的推測(cè)。A. must have been表示一定做了某事。用于肯定推測(cè)；B. should have been 本應(yīng)該，表示應(yīng)該做而沒(méi)有做某事。C. could have been用于肯定句時(shí)，表示可能做了某事。更常用于否定推測(cè)；D. may have been 可能做過(guò)某事。表示可能性很小。結(jié)合語(yǔ)境判斷，A最佳。
考點(diǎn)：考查情態(tài)動(dòng)詞表市對(duì)過(guò)去推測(cè)的用法。