C by the time 是完成时的标志,即:从句出现by the time,主句要用完成时态.此题的从句是过去时态,所以主句使用过去完成时,若从句是现在时态,则主句用现在完成时.意思是:等到救火车到达的时候,房子早已烧尽了.
By the time the fire engines arrived,the house__to the groun
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