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1. 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)
(E) while sparing
when 和while在用法上有什么区别? |
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