I know that it will be difficult to pick him out in such a crowd, but if you ________ happen to see him, give him this packet.
| A．would | B．might |
| C．should | D．could |
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I know that it will be difficult to pick him out in such a crowd, but if you ________ happen to see him, give him this packet.
| A．would | B．might |
| C．should | D．could |
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