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 trappedD．would have been trapped
C
考查時態(tài)。根據(jù)before we came to their rescue用一般過去時，故煤礦工人被困為過去的過去，故用過去完成時，選C。
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