问题描述：
___(luck),he missed the train.
你曾忘记过锁门吗?
Have you ever___ ___ ___door?
等我到达车站时,车已经走了.
the bus had already ___by the time I ___to the bus stop.
你曾忘记过锁门吗?
Have you ever___ ___ ___door?
等我到达车站时,车已经走了.
the bus had already ___by the time I ___to the bus stop.
问题解答：
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