Question

The teacher won’t begin the class ______ all the students ______.

1. A.
   until ; stop to talk
2. B.
   until; stop talking
3. C.
   if; stop to talk
4. D.
   if ; stop talking

Answer 1

B
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。