Question

—He looks very happy. He ____have passed the exam, —I guess so. It’s not difficult after all.

—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

Answer 1

C

本题的含义是，他看起来很开心，那么他一定通过了考试才符合句意，must可以表示一定的意思，故本题选C。