It has been a long time for human to make to reach the moon.A. its easyB. it’s possibleC.

问题补充：

It has been a long time for human to make to reach the moon.

A. its easy

B. it’s possible

C. it truth

D. it possible

答案：

A. its easy

B. it’s possible

C. it truth

(答案→)D. it possible

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