No one has turned on the air conditioner______.

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问题 No one has turned on the air conditioner______.

选项 A、yet
B、never
C、already
D、soon

答案A

解析 Adverbs of definite frequency may appear at the end of a sentence. Choice (B) is an indefinite frequency adverb. Choice (C) is used with a completed action. Choice (D) indicates a future time.  
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