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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】

試題分析：考查連詞。“It + will be + 時間段 + before...”句型中，表示“要過多久…才…”。句意：——你認為中國要多久才能發(fā)射載人宇宙飛船到月球？——或許兩三年吧。故D正確。

考點：考查連詞

 

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