__________(只有当新的淘金人潮进入这片区域后) did gold land become troubling scarce.

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问题  __________(只有当新的淘金人潮进入这片区域后) did gold land become troubling scarce.

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答案Only after new waves of gold miners entered the fields

解析 “淘金人潮”waves of gold miners,“只有”only,句子谓语用了过去时,所以,此处enter也用了相应的形式entered。
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