We were looking for you all this morning. You office without a word.
A. mustn’t have left
B. shouldn’t have left
C. couldn’t have left
D. needn’t have left
网友回答
A. mustn’t have left
(答案→)B. shouldn’t have left
C. couldn’t have left
D. needn’t have left
解析：
试题分析: 句意：我们一上午都在找你。你不应该一声不吭就离开办公室。must表示推测不用于否定句，排除A选项；shouldn’t have done本不应该做（但做了）；couldn’t have done不可能做过；needn’t have done 本没必要做，由句意可知此处表示责怪，选B。