【2013广东】—Someone is knocking at the door. Is it Ann?
—It ______be her. She is giving a performance at the theater now.
| A．may | B．must |
| C．can’t | D．mustn’t |
【2013广东】—Someone is knocking at the door. Is it Ann?
—It ______be her. She is giving a performance at the theater now.
| A．may | B．must |
| C．can’t | D．mustn’t |
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