问题
选择题
It is possible that ______ 2030, cars and airplanes will run on the new fuel.
A．by
B．on
C．until
D．at
答案
答案：A
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It is possible that ______ 2030, cars and airplanes will run on the new fuel.
A．by
B．on
C．until
D．at
答案：A