_____ some mammals came to live in the sea is now known.A、WhichB、SinceC、Althou

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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

解析本题考查主语从句。关系副词how引导的句子作整个句子的主语，故选D。句意为：有些哺乳动物是如何转而生活在海洋里现在已经为人们所知。

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