题文
Every possible means ______ to save the woundedsoldier up to now.
| A．was tried |
| B．were tried |
| C．have been tried |
| D．has been tried |
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Every possible means ______ to save the woundedsoldier up to now.
| A．was tried |
| B．were tried |
| C．have been tried |
| D．has been tried |
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