问题
选择题
______ there is a snowstorm or other bad weather ,the bus always comes on time.
A．Because
B．if
C．When
D．Unless
答案
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”。
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______ 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”。