--- ________ David be the new chairperson of the Students’ Union?
--- He _______ be, but I’m not sure.
| A．Can; can’t | B．Can; may |
| C．May; must | D．May; mustn’t |
--- ________ David be the new chairperson of the Students’ Union?
--- He _______ be, but I’m not sure.
| A．Can; can’t | B．Can; may |
| C．May; must | D．May; mustn’t |
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