A British official said that_____ this impractical policy could be changed , the future for Britain was indeed dark.
A．unlessB．whenC．ifD．until
A

試題分析：考查連詞：A．unless 除非，B. when當…時候， C.if如果，D.until直到，句意：一個英國官員說：英國的未來會很黑暗除非這個不實用的政策被改變。選A。
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