The coal miners in the coal mine for 10 hours before we came to their rescue.
| A．had trapped | B．had been trapping |
| C．had been trapped | D．would have been trapped |
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The coal miners in the coal mine for 10 hours before we came to their rescue.
| A．had trapped | B．had been trapping |
| C．had been trapped | D．would have been trapped |
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