______ there is a snowstorm or other bad weather ,the bus always comes on time.
A．BecauseB．ifC．WhenD．Unless
D
      題意：除非有暴風(fēng)雪或者其他惡劣天氣，那輛公共汽車(chē)總是按時(shí)到達(dá)。unless =" if" not “如果不，除非”。
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