题目内容
51.[2000上海] My sister met him at the Grand Theatre yesterday afternoon, so he ________ your lecture.
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A. couldn't have attended |
B. needn't have attended |
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C. mustn't have attended |
D. shouldn't have attended |
答案：A
提示：
提示：
题目考察表达对过去事情的否定推测——could not have done
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