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A
x
B
正确答案 ：B
解析
句意“每一个个体细胞，无论是作为一个独立的微生物存在，还是一个复杂生物的一部分，都有它自己的生命周期。” whether...or...引导的从句缺主语，exists为谓语动词，它前面的代词为主语，不能用所有格形式的its，应改为it。故本题答案为B。
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