题文
Ladies and gentlemen, please fasten your seat belts. The plane __________.
| A．takes off |
| B．is taking off |
| C．has taken off |
| D．took off |
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Ladies and gentlemen, please fasten your seat belts. The plane __________.
| A．takes off |
| B．is taking off |
| C．has taken off |
| D．took off |
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