导读题目:Whenandwheretobuildthenewfactory______yet.A：isnotdecided(正确)B：arenotdecided....

题目:

When and where to build the new factory ______ yet.

A： is not decided (正确)

B： are not decided

C： has not decided (误选)

D： have not decided

题中有yet为什么不用完成时?

答：选A

解析：“疑问词 to do sth.”作主语，谓语动词用单数形式，与不定式短语作主语，谓语动词也用单数形式相同。由此可以排除B, D; decide 与 when and where to …存在着逻辑上的动宾关系，表被动，故应使用被动语态，因此该题正确答案为A. 如果C项为has not been decided, 则也正确。