______ some mammals came to live in the sea is not known.A、Which onlyB、SinceC、

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问题 ______ some mammals came to live in the sea is not known.

选项 A、Which only
B、Since
C、Although
D、How

答案 D

解析 主语从句。根据句子结构,空格处需要一个关系副词构成主语从句,四个选项中只有how可以。
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