4. Please wear a mask throughout the class and leave the windows open for better ______ even with the air-conditioners on.
(A) penetration
(B) ventilation
(C) veneration
(D) prolongation
詳解 (共 3 筆)
未解鎖
請全班戴口罩並在空調開啟的狀態下保持窗戶...
未解鎖
翻譯：請全班同學戴上口罩，並且打開窗戶保...
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