问题
The nine coal miners ________ in the coal mine for 20 hours before we came to their rescue in Yanshan County, Jiangxi Province.[ ]
A: had trapped
B: had been trapping
C:ounty, Jiangxi Province/T
D: had been trapped
B: had been trapping
C:ounty, Jiangxi Province/T
D: had been trapped
正确答案是：
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