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

試題分析：句意：你認(rèn)為還要有多久中國才能發(fā)射另一個載人飛船上月球。這里do you think 是插入語，這句話用了固定句型：It will be+一段時間+before…，要多久才…，since也可以和一段時間連用，但是是：It is/has been+一段時間+since，所以選D。
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