问题描述：
新概念英语句子中过去时ed发音问题
1、if a train entered this tunnl 2.failed to.3ordered several tons of.等等很多,根本听不到有ed发音,
1、if a train entered this tunnl 2.failed to.3ordered several tons of.等等很多,根本听不到有ed发音,
问题解答：
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