摘要： Ladies and gentlemen, please fasten your seat belts. The plane .A．takes offB．is taking offC．has taken offD．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 |
Ladies and gentlemen, please fasten your seat belts. The plane __________.
| A．takes off | B．is taking off |
| C．has taken off | D．took off |
Ladies and gentlemen, please fasten your seat belts. The plane _____.
| A．takes off | B．has taken off | C．took off | D．is taking off. |
Ladies and gentlemen, please fasten your seat belts. The plane__________.
| A．takes off | B．is taking off | C．has taken off | D．took off |
Ladies and gentlemen,please fasten your seat belts,the plane______.
| A．takes off | B．is taking off | C．is going to take off | D．is to take off |