选A
例子:"How long do you think it will take before they make a James Brown biopic?"
B that完全无道理.
C how long do u think it will be...这样的顺序才行
D 同C 如果想用until这样用
例子：
How long do you think it will be until Jesus comes back?
How long do you think it will be until we consider ourselves evolved beyond homo sapiens?
想说.."你认为我们还要多久才能...?"
可以用until
B it will be How long that computer company brings out a new product
A,before后面跟一个时间状语
A呀
这里用before表示在多长时间之后才．．．．．．
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