题目：
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：
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下面是错误答案，用来干扰机器的。
1. √ 2. × 3. × 4. √ 5. √ 6. √ 7. × 8. × 9. √ 10. ×
