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

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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

解析本题考查的是语法中主语从句的用法。此处关系副词how引导的句子作整个句子的主语，故选项D)为正确答案。本句意为“有些哺乳动物是如何转而生活在海洋里已经为人们所知”。

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______somemammalscametoliveintheseaisnowknown.A、WhichB、SinceC、Altho