--_______ will the meeting last?
--_______ they reach an agreement.
| A．How long; Not until | B．When; Not until |
| C．How long; Until | D．When; Until |
--_______ will the meeting last?
--_______ they reach an agreement.
| A．How long; Not until | B．When; Not until |
| C．How long; Until | D．When; Until |
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