When and where to build the new school ___________ (not decide) yet .
问题描述：
When and where to build the new school ___________ (not decide) yet .
答
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
答
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
答
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.