smallpox's vaccine-->天花的疫苗
smallpox vaccine-->天花疫苗
前面句子 most vaccines 大多數疫苗 (很多種疫苗)
根據平行 及句意 都會選擇 (B) smallpox vaccine which is derive from
前一句 most vaccine are derived from
不是很好麼?!
(c) smallpox's vaccine which gets derived from
也應該是 be derived from 才對
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