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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