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单选题
The（）into the fire accident was carried out by two policemen.
A
question
B
doubt
C
investigation
D
information
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单选题Preventive maintenance （）.A
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is a kind of maintenances carried out after the occurrence
考题
单选题The（）into the fire accident was carried out by two policemen.A
questionB
doubtC
investigationD
information
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