单选题 As soon as we ______ the new assembly plant, our production capacity will almost double or even triple.
A. are completed
B. completing
C. will complete
D. complete

【正确答案】 D

【答案解析】高级问题空格处应填入谓语动词，并且是主动语态。根据句首的as soon as来考虑时态，由于它是引导时间状语从句的连词，所以不能用将来时，只能用现在时。
非谓语动词＞单复数＞主动语态与被动语态＞时态→参考“托业语法考点汇总”