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---How long do you think it will be __________ China sends a manned spaceship to the moon?

--- Perhaps two or three years.

A. when B. until

C. that D. before

 

D

【解析】

试题分析:考查连词。“It + will be + 时间段 + before...”句型中,表示“要过多久…才…”。句意:——你认为中国要多久才能发射载人宇宙飞船到月球?——或许两三年吧。故D正确。

考点:考查连词

 

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