I cannot find Tom anywhere.He ______have been off long. I heard him make a call

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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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