—Listen ! Helen is singing in the next room.
It ____ be Helen. She has gone to Beijing.
| A．can’t | B．mustn’t | C．may | D．neen`t |
—Listen ! Helen is singing in the next room.
It ____ be Helen. She has gone to Beijing.
| A．can’t | B．mustn’t | C．may | D．neen`t |
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