---So many people are standing outside the hall. ________ will the concert begin?
---________ seven o'clock.
| A．How soon; Until | B．How long; Until |
| C．How long; Not until | D．How soon; Not until |
---So many people are standing outside the hall. ________ will the concert begin?
---________ seven o'clock.
| A．How soon; Until | B．How long; Until |
| C．How long; Not until | D．How soon; Not until |
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