题文
The head of the company promised to deal with matters of this sort________he returned to his office.
| A．until |
| B．while |
| C．by the time |
| D．the moment |
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The head of the company promised to deal with matters of this sort________he returned to his office.
| A．until |
| B．while |
| C．by the time |
| D．the moment |
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