Nobody knows how people first came to these islands. They must have come from So

游客2023-12-15 40

问题 Nobody knows how people first came to these islands. They must have come from South America on rafts.

选项

答案 must——might

解析前半句强调“无人知道”，因此后半句应当是不肯定的推测，用might have done。must have done是肯定推测，与句意不符。

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