16．-What's the matter，Ann？
-You know，I'm never ______ my best early in the morning．（　�。�
A．inB．atC．withD．within

分析 --Ann，怎么啦？
--你懂的，大清早我從來不會處于最佳狀態(tài)．

解答 答案是B．本題主要考查固定介詞短語． at one's best表示"處于最佳狀態(tài)"；由第一句判斷，Ann似乎狀態(tài)不佳，所以答句用never at my best表示"從不在最佳狀態(tài)"，所以答案選擇B．

點評 介詞辨析要在掌握各介詞的基本用法和固定搭配的基礎(chǔ)上結(jié)合語境做出符合邏輯、常理的推測．

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