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________ you know little about protectin...

________ you know little about protecting yourself against the novel coronavirus (新冠病毒), you'd better search for more information about it online.

A.Unless B.Since C.Though D.Whether

 

B 【解析】 句意:既然你对保护自己避免感染新冠病毒不怎么了解,你最好在网上搜寻关于它的更多信息。 考查连词。unless除非;since既然,因为;though虽然;whether是否。“you know little about protecting yourself against the novel coronavirus”表示原因,用since引导原因状语从句。故选B。  
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