In a sport's team, each player has a clear role, and there are few occasions __________ members are confused or uncertain of their roles.
| A．which |
| B．that |
| C．when |
| D．how |
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In a sport's team, each player has a clear role, and there are few occasions __________ members are confused or uncertain of their roles.
| A．which |
| B．that |
| C．when |
| D．how |
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