he once heard the song -------in english.A.sing B.sung C.sang D.singing

题目

he once heard the song -------in english.A.sing B.sung C.sang D.singing
应选B 为什么?我选D

答案

dude your grammar suckheard mean's past tense so sing should be past tense.that is sang.but heard once mean's he was singing it was some else singing it.so past tense need change to past participle th...