— Show me your permit, please.
—Oh, it's not in my pocket. It
| A．might fall out | B．could fall out |
| C．should have fallen out | D．must have fallen out |
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— Show me your permit, please.
—Oh, it's not in my pocket. It
| A．might fall out | B．could fall out |
| C．should have fallen out | D．must have fallen out |
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