题文
________ he could call the police, the thieves had run away with the suitcase, leaving him shocked and helpless.
| A．Before | B．Until |
| C．Because | D．Unless |
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________ he could call the police, the thieves had run away with the suitcase, leaving him shocked and helpless.
| A．Before | B．Until |
| C．Because | D．Unless |
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