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

A. before
B. since
C. while
D. when
A
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科目：高中英語(yǔ) 來源：河南省模擬題 題型：單選題

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

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