[单选题]__________some medals came to live in the sea is not known.

A
Which
B
Since
C
Although
D
How
正确答案:D
题目解析
该句的从句由疑问副词how引导的主语从句。选项B、C中的since和a1though不能引导主语从句;选项A中的which虽能引导主语从句,但与some矛盾。
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