题文
—Dave called you about half an hour ________，Anna．
—Thank you．I’ll call him back．
| A．ago |
| B．before |
| C．after |
| D．later |
—Dave called you about half an hour ________，Anna．
—Thank you．I’ll call him back．
| A．ago |
| B．before |
| C．after |
| D．later |
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