__________ some medals came to live in the sea is not known.A.Which B.Since C.Although D.How

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__________ some medals came to live in the sea is not known.
A.Which B.Since C.Although D.How

答案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.查看原帖>>