--- Look at the boy running on the ground. Is it Frank?
--- It ________ be him. I saw him go to the library just now.
| A．mustn’t | B．can’t |
| C．needn’t | D．might not |
--- Look at the boy running on the ground. Is it Frank?
--- It ________ be him. I saw him go to the library just now.
| A．mustn’t | B．can’t |
| C．needn’t | D．might not |
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