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As Zhong Nanshan puts it, a surgical mas...

As Zhong Nanshan puts it, a surgical mask is enough _______ one uses it for daily protection.

A.unless B.before C.if D.since

 

C 【解析】 考查连词词义辨析。句意:正如钟南山所说,如果仅用于日常保护的话, 医用口罩就足够了。A. unless除非;B. before在……之前;C. if如果;D. since自从,因为。结合语境可知,此处是条件状语从句,故选C项。  
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