Scientists also have no idea how long it will be before all wild animals in the cages _____.
| A．should be set free | B．will be set free |
| C．are set free | D．would be set free |
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Scientists also have no idea how long it will be before all wild animals in the cages _____.
| A．should be set free | B．will be set free |
| C．are set free | D．would be set free |
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