问题
Many people can’t learn lessons from the mistakes they’ve made_____they get hurt somehow.
A:whether
B:unless
C:if
D:as;
B:unless
C:if
D:as;
正确答案是：
同类题型
______ do you watch TV —Once a week
Can you come on Monday or Tuesday—I ‘m afraid ________ day is possible.
Why not take this road It’s a shortcut — I am afraid we can’t It _____
from the factory forced him to leave his hometown and seek for job opportunities in other cities.
There is _______ in persuading him when he turns adeaf ear to you.