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题目内容
（国家开放大学理工英语4）
by the promise of these tiny tubes, people are already working to turn the Space Elevator into a reality.
单选题 (10 分) 10分
A.
To fuel
B.
Fueling
C.
Fueled
单选题 (10 分) 10分
A.
To fuel
B.
Fueling
C.
Fueled
参考答案