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

admin2018-05-06 23

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。

转载请注明原文地址:https://kaotiyun.com/show/dpWC777K

英语

相关试题推荐

随机试题

最新回复(0)