【题目】Students’ active performances in class will be the new normal ________ teachers give them more chances.
A. althoughB. onceC. until D. since
在线课程【答案】B
【解析】句意：一旦老师们给孩子更多的机会，学生们在课堂上的积极表现将成为新的常态。although尽管，虽然；once一旦；until直到；since自从，既然。根据主从句之间的关系判断，选B。