______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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本试题收录于: 英语题库普高专升本分类
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