_______you have already registered for the 2007 Forum, attend this free pre-foru

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问题 _______you have already registered for the 2007 Forum, attend this free pre-forum class.

选项 A、Although
B、Regarding
C、As
D、If

答案 D

解析 只要出现两个“S+V”。就要考虑填入连词!B选项是介词,应排除。剩下的都是引导状语从句的连词,答案就要通过释义来判断。
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