249 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 答案是E，我想请问一下when 和 while在这句话中的使用有什么区别吗？谢谢！
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发表于 2004-1-28 11:34:00
