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√
A
x
B
正确答案 :B
解析
句意“人类有33或者34根椎骨,但蛇可能有多达300根椎骨。” 谓语动词为have,且Human being前并没有表示单数的不定冠词a,说明主语不是第三人称单数而是复数,应改为beings。故本题答案为B。
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