问题补充：
How long we take part in the college entrance examination?
A. is it since
B. will it be before
C. is it when
D. will it be since
答案：
A. is it since
(答案→)B. will it be before
C. is it when
D. will it be since
解析：考查固定句型：句意：还要多长时间我们就要参加高考了？这句话用的是：It will be +一段时间+before+从句，“还要多长时间就….”，对一段时间提问，用how long，选B。
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