—He ______ be in the classroom, I think.
—No, he ______ be in the classroom. I saw him go home a minute ago.
| A．can; might not | B．must; might not |
| C．might; can’t | D．might; mustn’t |
—He ______ be in the classroom, I think.
—No, he ______ be in the classroom. I saw him go home a minute ago.
| A．can; might not | B．must; might not |
| C．might; can’t | D．might; mustn’t |
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