The teacher won’t begin the class all the students .
A. until ; stop to talk
B. until; stop talking
C. if; stop to talk
D. if ; stop talking
网友回答
A. until ; stop to talk
(答案→)B. until; stop talking
C. if; stop to talk
D. if ; stop talking
解析：此题考查了两个知识点“not...until”意为“直到...才”和“stop to do sth”与“stop doing sth”的区别。