classes______.let's go to the classroom.a.begins b.begin c.beginning
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classes______.let's go to the classroom.a.begins b.begin c.beginning
classes______.let's go to the classroom.a.begins b.begin c.beginning
classes______.let's go to the classroom.a.begins b.begin c.beginning
B
b.begin
开始上课了.让我们去教室吧.