Question

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

Answer 1

B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。