Every means _________, but none proved __________.
| A．have tried; a success |
| B．have been tried; successful |
| C．has tried; to be successful |
| D．has been tried; successful |
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Every means _________, but none proved __________.
| A．have tried; a success |
| B．have been tried; successful |
| C．has tried; to be successful |
| D．has been tried; successful |
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