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 语境表示语气很肯定的否定判断推测：我刚才还听见他打电话了，因此他一定没走多远。用can’t have done／shouldn’t have done表示本不应该做某事；mustn’t have done表示禁止做某事；而needn’t have done指的是本来没必要做某事。
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