题文
---Is that Lucy’s sister, Lily?
---No, it _______ be her. She has gone to English.
| A．could | B．can | C．can’t | D．mustn’t |
---Is that Lucy’s sister, Lily?
---No, it _______ be her. She has gone to English.
| A．could | B．can | C．can’t | D．mustn’t |
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