【題目】I heard Mary _______ the piano at that time.
A.play
B.played
C.playing
D.to play

【答案】C
【解析】hear sb do sth 聽見某人做某事(指聽見全過程);hear sb doing sth 聽見某人正在做某事。句末的 at that time (在那時)是過去的時間點,故選 C。句意是:那時我聽見瑪麗正在彈鋼琴。

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