为什么这里不要还原to?I heard the boy singing just now.The boy was heard singing just now.
人气：428 ℃ 时间：2020-05-09 10:31:16
解答
hear +宾语 +宾补[ do/doing/v+ed ]
hear +宾语 +do宾补此结构中是省略了to的不定式.当变成被动时才要还原to
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