题文
—Is that boy Alan?
—No, it ______ be him. He left for Beijing yesterday.
| A．can’t | B．shouldn’t |
| C．needn’t | D．mustn’t |
—Is that boy Alan?
—No, it ______ be him. He left for Beijing yesterday.
| A．can’t | B．shouldn’t |
| C．needn’t | D．mustn’t |
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