2. 外语
  3. _________ some mammals came to live in the sea is not known.

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

admin2010-01-15  32
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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