After a series of researches, they finally ___ that the pollution was the leading factor contributing to the death of the creatures in the river.
| A．drew a conclusion |
| B．came a conclusion |
| C．arrived a conclusion |
| D．made the decision |
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After a series of researches, they finally ___ that the pollution was the leading factor contributing to the death of the creatures in the river.
| A．drew a conclusion |
| B．came a conclusion |
| C．arrived a conclusion |
| D．made the decision |
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