问题
选择题
I am going to Tian’anmen Square to watch the raising of the national flag with Lin Tao ________ it rains early tomorrow morning.
A．if
B．unless
C．when
D．since
答案
答案：B
题目分析：句意：。我要与林涛去 * * 广场观看升国旗，除非明天清晨下雨。If如果；unless除非；when当……的时候；since自从。所以选B。