He-------------(know)the city since he was very young.

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He-------------(know)thecitysincehewasveryyoung.He-------------(know)thecitysincehewasveryyoung.He--

He-------------(know)the city since he was very young.
He-------------(know)the city since he was very young.

He-------------(know)the city since he was very young.
has known

通俗的翻译:打小他就对这个城市很熟悉了

had known.since出现用用完成时态,整个句子是过去时,因此用过去完成时。