By the time we got home,my mother _______ (go) out for a walk.

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By the time we got home,my mother _______ (go) out for a walk.

By the time we got home,my mother _______ (go) out for a walk.
By the time we got home,my mother _______ (go) out for a walk.

By the time we got home,my mother _______ (go) out for a walk.
had gone
by the time后面是过去式的话,它的主句应该是过去完成式

had gone