题目内容

We were looking for you all this morning. You    office without a word.
A．mustn’t have leftB．shouldn’t have leftC．couldn’t have leftD．needn’t have left
B

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。
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