问题: 不懂吖
when and where to go for the holiday ( )yet.
A are not decided B have not been decided
C is not being decided D has not been decided
答案是选d，我不明白，请赐教！
解答:
句子属于wh--+不定式的结构,When and where to go for the holiday在句中作主语,本来就是考一个结构,作为整体使用,谓语用单数.
又因为"yet"有提示需要用现在完成时.
综上:选D
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