When and where to build the new school ___________ (not decide) yet .

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When and where to build the new school ___________ (not decide) yet .
When and where to build the new school ___________ (not decide) yet .

When and where to build the new school ___________ (not decide) yet .
从后面的yet来看应该用现在完成时,因此是has not been decided 因为同时用两个或更多的疑问词引导的主语从句看作是一个整体,谓语用单数.但如果是两个并列的主语从句作主语,谓语应该用复数.
如:What he has done and why he did it are not quite clear.

主语When and where to build the new school 一件事情的2个方面,看做单数
后面的yet表明用现在完成 填 has not been decided

are not decided
主语是 when and where to build the new,是复数,所以用are。
被决定,所以用被动形式。
希望能帮到您,我用的是手机,如果有疑问请发消息问我,我收不到追问~O(∩_∩)O