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

A.unlessB.beforeC.ifD.since

【答案】C

【解析】

考查連詞詞義辨析。句意:正如鐘南山所說,如果僅用于日常保護的話, 醫(yī)用口罩就足夠了。A. unless除非;B. before在……之前;C. if如果;D. since自從,因為。結合語境可知,此處是條件狀語從句,故選C項。

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