Question

When and where to go for the on salary holiday __

When and where to go for the on-salary holiday ______ yet.
A.are not decided B.have not been decided
C.is not being decided D.has not been decided

本题考查主谓一致和时态。因主语为一个动词不定式短语，所以应为单数，再根据时间状语yet分析，此处使用现在完成时态。
答案：D

因主语为一个动词不定式短语，所以应为单数，那如果改成When to go and where to go 呢？

Answer 1

改成When to go and where to go 会显得很累赘 一般不这样改
如果非得改的话 后面要用复数形式

Answer 2

若主语是不定式或动名词，谓语动词用三单形式。一般不会出现When to go and where to go这样的表达。

Answer 3

那就应该选B，如果是when to go and where to go,那就是两个，所以用have