The girl was often heard _______ happily in her room.
A．singsB．singC．singingD．to sing
D

試題分析：句意：這個女孩經(jīng)常被聽到在她的房間里快樂的唱歌hear sb. do sth,聽見某人做某事，當這個句型用于被動結(jié)構(gòu)中的時候，動詞原形前要加上to。故選D。
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