once met it won't be easily forgotten?此句met为何用过去时?+

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once met it won't be easily forgotten?此句met为何用过去时?+
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once met it won't be easily forgotten?此句met为何用过去时?+
once met it won't be easily forgotten?此句met为何用过去时?+

once met it won't be easily forgotten?此句met为何用过去时?+
这里是用的虚拟语气

once met曾经相遇 过去发生的事不用过去时用什么？