问题
Our class will go to the National Park next Sunday ——________ it rains, of course
A:when
B:unless
C:for
D:whether
B:unless
C:for
D:whether
正确答案是：
同类题型
In the dark street, there wasn’t a single person __________ she could turn for help.
You can ______ this car with that one; then you will see which one is better.
She will have to find some other work，for she can’t ______ this loud noise any more.