你多写了个"you"
选C
Don't smoke until the plane has taken off.直到飞机起飞你才可以吸烟.
not …until… 直到……才……
现在完成时（have/has done sth.）强调对现在的影响.
Don't you smoke until the plane __ off.
Don't you smoke until the plane __ off.
A takes B took C has taken D had taken
A takes B took C has taken D had taken
英语人气：289 ℃时间：2020-01-31 15:04:36
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