*76.I heard this song _____ by my students in the next room.

题目

*76.I heard this song _____ by my students in the next room.
A.sing
B.singing
C.to sing
D.being sung
请帮忙翻译并分析.

答案

heard sb doing sth.听见某人做某事.
this song,只能被唱,by也是被动句的标志,所以用被动时态,be动词加动词的过去分词形式,sing的过去分词是sung,
强调做了某事,be用being.
所以是being sung