题目内容

How long do you think it will be _______ China sends another manned spaceship to the moon?
A．whenB．untilC．thatD．before
D

试题分析：句意：你认为还要有多久中国才能发射另一个载人飞船上月球。这里do you think 是插入语，这句话用了固定句型：It will be+一段时间+before…，要多久才…，since也可以和一段时间连用，但是是：It is/has been+一段时间+since，所以选D。
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