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How long do you think it will be _______...

How long do you think it will be ________ China sends another manned spaceship?

A. that    B. before    C. since    D. when

 

B 【解析】 考查常见句型。句意:你认为还要有多久中国才能发射另一个载人飞船?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,但是句型是:It is/has been + 一段时间 + since,故选B。  
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