问题描述：
How long do you think it will be __ China sends a manned spaceship to the moon?
ow long do you think it will be __ China sends a manned spaceship to the moon?
A.after B.until C.that D.before
ow long do you think it will be __ China sends a manned spaceship to the moon?
A.after B.until C.that D.before
问题解答：
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