问题
选择题
| 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 |
答案
答案：C
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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 |
答案：C