The human skeleton consists of more than two hundred bones ______together by tough and relatively inelastic connective tissues c

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问题 The human skeleton consists of more than two hundred bones ______together by tough and relatively inelastic connective tissues called ligaments.

选项 A、are bound
B、to bind
C、bind them
D、bound

答案D

解析句意：人类骨骼是由200多块骨头组成，这些骨头由坚硬的并相对弹性较小的连接组织，即所说的韧带，连接在一起。bind结合，使紧密连接。由题干可知，本题考查定语从句，因此空格处应当填入动词的分词形式，只有D项符合要求，bound是bind的过去分词。

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