Our music teacher is always heard in the music room.A. singB. sangC. singingD. to sing

发布时间：2020-08-21 10:35:46

Our music teacher is always heard      in the music room.
A. sing
B. sang
C. singing
D. to sing

网友回答

A. sing
B. sang
C. singing
(答案→)D. to sing
解析：hear sb do sth表示听到某人经常做某事，变为被动语态时结构变为be heard to do sth.
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