When Tom.When Tom___(cross) the street,he ______(knock) down by a truck.

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When Tom.When Tom___(cross) the street,he ______(knock) down by a truck.
When Tom.
When Tom___(cross) the street,he ______(knock) down by a truck.

When Tom.When Tom___(cross) the street,he ______(knock) down by a truck.
When Tom_was crossing__(cross) the street,he ___was knocked___(knock) down by a truck.

crossed
was knocked

was crossing,was knocked

crossed,was knocked 对

首先是过去式,when后不用进行式,用短暂动词.第二是被动语态