2. 外语
  3. —I cannot find Tom anywhere. —He ________ have been off long. I heard him make a call just now.

—I cannot find Tom anywhere. —He ________ have been off long. I heard him make a call just now.

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问题 —I cannot find Tom anywhere.   
—He ________ have been off long. I heard him make a call just now.
选项 A、shouldn’t
B、can’t
C、mustn’t
D、needn’t
答案B
解析 shouldn’t have done 表示“ 本不应该做某事” ；can’t have done 表示“ 不可能做了某事”；“ mustn’t have done”表示“ 禁止做某事”；needn’t have done 表示“ 本来没必要做某事”? 故选 B?
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