______the weather improves, we will suffer a huge loss in the tourist industry.

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问题 ______the weather improves, we will suffer a huge loss in the tourist industry.

选项 A、As
B、Since
C、While
D、Unless

答案D

解析 除非天气转好。否则我们的旅游业会承受巨大的损失。本题考查连词的用法。as作为连词使用的时候,意为"当…的时候"、"因为"等词意;since意为"既然"、"自从"等词意;’while意为"当…的时候"和"而"等意思;unless意为"除非,如果不…"。参考例句:(1)You’ll fail in French unless you work harder.(你要是不再加把劲,法语就考不及格了)。(2)I wouldn’t be saying this unless I were sure of the facts.(要是我对这些事情没有把握,我就不说这话了)。
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