．—What’s the matter with the man hanging his head there?
—Well, if you _______ know, he was caught stealing my bike.
| A．must | B．may | C．can | D．shall |
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．—What’s the matter with the man hanging his head there?
—Well, if you _______ know, he was caught stealing my bike.
| A．must | B．may | C．can | D．shall |
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