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-He looks very happy. He have passed the exam, -I guess so. It's not difficult a

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-He looks very happy. He have passed the exam, -I guess so. It's not difficult a

—He looks very happy. He ____have passed the exam,

   —I guess so. It's not difficult after all.

    A. should         B. could              C. must               D. might

试题答案

C