问题
选择题
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
答案：D
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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：D