题目内容

__________ some maddals came to live in the sea is not
A．Which B．SinceC．AlthoughD．How
D
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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