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---When will the expert come and give the lecture on economic development?
---Not until our program_______.
| A．is approving | B．is to approve |
| C．has been approved | D．will be approved |
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---When will the expert come and give the lecture on economic development?
---Not until our program_______.
| A．is approving | B．is to approve |
| C．has been approved | D．will be approved |
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