EveryFridayistheschoolopenday,__

发布时间：2020-07-25 20:18:01

Every Friday is the school open day , _______ parents can go to the class to observe it.A.whereB.whenC.whoseD.which

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B解析考查定语从句。先行词是the school open day ,在定从__________ parents can go to the class to observe it中作时间状语，所以选B。
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