Until a few centuries ago, any large bones discovered in the fields or caves of LACE w:st="on">EuropeLACE>, now known to be large prehistoric animals, were usually assumed to be the remains of giants and were often displayed as curiosities in castles, palaces, town halls, churches, and monasteries.
- now known to be large prehistoric animals, were usually assumed to be
- presently known as from large prehistoric animals, were usually assumed as
- bones now known to be those of large prehistoric animals, were usually assumed to be
- bones known at present as of large prehistoric animals, were usually assumed as those of
- currently known as those of large prehistoric animals, were usually assumed to be those of
答案C中，bones now know to be those of large prehistoric animals中bones 是什么成分呢？ | 
