when I heard the folk song ______in a foreign language.I couldn't help singing with the singer.A sing B singing C to sing D sung

when I heard the folk song ______in a foreign language.I couldn't help singing with the singer.A sing B singing C to sing D sung
when I heard the folk song ______in a foreign language.I couldn't help singing with the singer.
A sing B singing C to sing D sung

when I heard the folk song ______in a foreign language.I couldn't help singing with the singer.A sing B singing C to sing D sung
D
听到歌曲被用外语唱出..

B

D
see sth. done结构
听到歌曲用外语被唱出
例如I saw my hair cut yesterday.

B
hear+doing sth( 强调的是片刻,正在发生的某一刻)
hear+do sth(强调的是一整个过程)

D,秀才说的对