Someone called me up in the middle of the night, but they hung up _____ I could answer the phone.
| A．as |
| B．since |
| C．until |
| D．before |
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Someone called me up in the middle of the night, but they hung up _____ I could answer the phone.
| A．as |
| B．since |
| C．until |
| D．before |
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