科学家发现的事实说明已经是发生过得事情了,不可能说这话的时候科学家还知道石头正在被标记.因此不能用现在进行时.其次find后面可以加doing表示发现正在做什么,但是find后面同样可以加句子,这里加的就是句子,marked是过去时,也是宾语从句中的谓语动词
Scientists found many stones____with numbers on the mountain
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