—I saw Sam in the library yesterday morning. —You______him, he is still abroad.

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问题 —I saw Sam in the library yesterday morning. —You______him, he is still abroad.

选项 A、might not see
B、could not see
C、can’t have seen
D、mustn’t have seen

答案C

解析 考查情态动词的用法。can not have done表示判断,意为“不可能做了某事”。
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