Long long ago,there was a great fire in the forests that ___

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    Long long ago,there was a great fire in the forests that (covered) our earth.

    很久以前,覆盖地球的森林遭受了一场巨大的火灾.

    解释:这里需要填一个动词在定语从句中做谓语,因为这里一般过去时态的,所以可以填过去式covered.而covering是现在分词,一个时态不合适,另一点它不能脱离be动词而单独作谓语.