各家說法不一 請高人(會的人)指點

[Superjenny]

unlike A,B 一般
變形 B, unlike A.
A是跟B的頭比較(S主詞)還是跟尾(O受詞)比啊?
兩個我都有看過對的答案
小妹不才請知道或做題經驗多的人指教
EX

根S比較 選B

53.(27297-!-item-!-188;#058&003151)



Most vaccines are derived from weakened or killed strains of the same virus that they prevent, unlike the derivation of smallpox vaccine from a different virus altogether.



(A) the derivation of smallpox vaccine from a different virus altogether

(B) smallpox vaccine, which is derived from a different virus altogether

(C) smallpox's vaccine, which gets derived from a different virus altogether

(D) when smallpox vaccine is derived from an altogether different virus

(E) the altogether different virus from which smallpox vaccine is derived

[raist]

應該都是跟S比較吧~ 這種句型應該是要把以下的兩個獨立句子合併所衍生的，
概念上應該要有相同的主詞，所以比較對象應該是S

Most vaccines are unlike the derivation of smallpox vaccine from a different virus altogether.
Most vaccines are derived from weakened or killed strains of the same virus that they prevent.