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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