【題目】—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 been

C.could have beenD.may have been

【答案】A

【解析】

考查情態(tài)動詞。句意：—昨天上午我給你打電話。一個女孩回答的，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 本應該，表示應該做而沒有做某事。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。結合語境判斷，表示非�？隙ǖ耐茰y，故選A。

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