______some mammals came to live in the sea is now known.

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问题 ______some mammals came to live in the sea is now known.

选项 A、Which
B、since
C、Although
D、How

答案D

解析 which：哪一个，哪些；since：因为，自……以来；although：虽然，尽管；how：如何，此处关系副词how引导的句子作整个句子的主语。故选D。

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