______ there is a snowstorm or other bad weather ,the bus always comes on time.
A. Because B. if C. When D. Unless
______ there is a snowstorm or other bad weather ,the bus always comes on time.
A. Because B. if C. When D. Unless
D
题意：除非有暴风雪或者其他恶劣天气，那辆公共汽车总是按时到达。unless = if not “如果不，除非”。