—I cannot find Tom anywhere. —He ________ have been off long. I heard him ma

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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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—IcannotfindTomanywhere.—He_______havebeenofflong.Iheardhimmakeacal