be heard doing /do 有具体时间用doing?

be heard doing /do 有具体时间用doing?

题目
be heard doing /do 有具体时间用doing?
答案
你好.一般说来,这由你的原始句决定:I heard him sing a new song (强调全过程)-------He was heard to sing a new song I heard him singing happily when I saw him (强调正在唱)------When seen, he was heard si...
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