in class和in the class
in class =during class 在上课，课堂上
in the class 在班级里面，在班上(班集体) in the classroom 在教室里(强调地点) No talking in class.课堂上不许说话。 =Don't talk in class. Tom is the tallest boy in the class/in our class. Tom and his brother are in the same class.
in the class 在班级里面，在班上(班集体) in the classroom 在教室里(强调地点) No talking in class.课堂上不许说话。 =Don't talk in class. Tom is the tallest boy in the class/in our class. Tom and his brother are in the same class.
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