題目列表(包括答案和解析)
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 |
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