_________ some mammals came to live in the sea is not known.A、WhichB、SinceC、Al

游客2023-11-21 7

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

选项 A、Which
B、Since
C、Although
D、How

答案 D

解析 “HOW”引导的名词从句做主语。

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