It has been found that even people insensitive to a certain smell______can suddenly become sensitive to it when exposed to it of

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问题 It has been found that even people insensitive to a certain smell______can suddenly become sensitive to it when exposed to it often enough.

选项 A、at large
B、at last
C、at least
D、at first

答案D

解析 本题考查at的短语辨析。at large意为“详细地”;at last意为“最终,最后”;at least意为“至少”;at first意为“首先,最初”。根据句意,应选D。
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