问题描述：
英语句子的时态问题
"When did you go to bed last night?" Father said to Anne.
Father asked Anne when she went to bed the night before.
为什么这里变间接引语时,不用改时态--过去完成时?
"When did you go to bed last night?" Father said to Anne.
Father asked Anne when she went to bed the night before.
为什么这里变间接引语时,不用改时态--过去完成时?
问题解答：
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