Doctors still know little about how the Listeria bacterium is spread and why the disease it causes, listeriosis, afflicts some people in a contaminated area though it spares many others. (A) though it spares (B) where it spares (C) despite sparing (D) when sparing (E) while sparing 答案为E 做这道题的时候也迟疑了半天,while的确比其他任何选项更好的表达了转折的意思,但是如果考虑和afflicts平行的话,spares无异更好,自己最终选了B。
Doctors still know little about how the Listeria bacterium is spread and why the disease "it" causes, listeriosis, afflicts some people in a contaminated area though it spares many others. (B) where it spares 在前文已出现it,指代listeria bacterium, 而B中it明显指代listeriosis(the disease), 出现歧义,所以B一定错.