As the experts tell us, we can pass on the flu _____ we realize we have it. [ ]A. before B. since C. while D. when -高中英语-n多题

◎ 题干

As the experts tell us, we can pass on the flu _____ we realize we have it.

A. before
B. since
C. while
D. when

◎ 答案

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◎ 解析

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◎ 知识点

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