2. 考研
  3. ______some mammals came to live in the sea is not known.

______some mammals came to live in the sea is not known.

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问题 ______some mammals came to live in the sea is not known.
选项 A、That
B、What
C、How
D、Since
答案C
解析 how引导主语从句，并在从句中作方式状语。
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考研英语一

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