问题补充：
The field research will take Luffy and Steven about two weeks; it will be a long time we again.
A. before; met
B. since; meet
C. before; meet
D. since; met
答案：
A. before; met
B. since; meet
(答案→)C. before; meet
D. since; met
解析：句意：该领域的研究将用掉Luffy和Steven约两个星期的时间；很长时间之后， 我们才能再次会面。1）It is a long time sine…表示自从.. 已经很久了。主句多用一般现在时态，从句用过去时态。 从句的动词若为瞬间动词，时间从动作的开始算起，从句的动词若为延续性动词，时间从动作的结束算起。It is 3 years since he left Shanghai. = It is 3 years since he was in Shanghai.他离开上海已经3年了。2）It will be long before…表示“很久以后将…”It will be long before the film is on。3）It won’t be long before … 表示“不久以后将…”It won’t be long before the film is on。故选C。
考点: 考查状语从句的用法。
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