They first reach an agreement on the basic principle, the details____later
| A．toworkitout | B．havingbeenworkedout |
| C．tobeworkedout | D．beingworkedout |
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They first reach an agreement on the basic principle, the details____later
| A．toworkitout | B．havingbeenworkedout |
| C．tobeworkedout | D．beingworkedout |
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