Anthropologists agree that our primitive ancestors who inhabited the tropics pro

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问题 Anthropologists agree that our primitive ancestors who inhabited the tropics probably have natural protection against the sun.

选项

答案 have—had

解析译文：人类学家赞同：生活在热带地区的远古祖先可能天生具有抵御阳光的保护力。
分析：考查时态。that从句的主语是our primitive ancestors(我们远古的祖先)，其谓语动词只能用过去时态，不能用现在时。此处have应改为had。

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