问题
It is reported in the newspaper that a man escaped from the prison last night and it was a long time______ the guards discovered what had happened[ ]
A: when
B: until
C: since
D: before
B: until
C: since
D: before
正确答案是：
同类题型
Tom is weak in physics. He always feels _______ beforehe takes a physics test.
work with a strong will, we can overcome anydifficulty, _____great it is
done, John! Not a single mistake ________ in yourexam paper this time!” said the teacher
Not only Tom but also I ______ crazy about playing basketball.