2. 外语
  3. Each virus strain is grown separately inside the eggs over the course of several days, which it is harvested, inactivated, and p

Each virus strain is grown separately inside the eggs over the course of several days, which it is harvested, inactivated, and p

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问题 Each virus strain is grown separately inside the eggs over the course of several days, which it is harvested, inactivated, and purified.
选项 A、from which
B、by which
C、after which
D、before which
答案C
解析 根据句意，采集、灭活和提纯发生在培养病毒之后，which指代前面整个句子的内容，因此这里用after符合句意。
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