A great many means ______ to fight the forest fire in Russia even Russian Prime Minister Putin took part in the fight personally.
| A．have been tried | B．has been tried | C．has tried | D．have tried |
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A great many means ______ to fight the forest fire in Russia even Russian Prime Minister Putin took part in the fight personally.
| A．have been tried | B．has been tried | C．has tried | D．have tried |
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