When ane where to go for the holiday ______yet.A.are not dec

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When ane 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
帮我看一下选哪一种答案,并说明原因,

B
翻译：什么时候旅游和到哪里旅游还没有决定.
根据翻译以及“yet"可以看出,这道题是现在完成时,因此A、C排除,又因为题目问的是“什么时候去度假”和“到哪里度假”相当于是两个主语,因此不是第三人称单数,所以不能用has,而应该用have,故答案选B.
再问：为什么有主语就不能用第三人称单数？
再答：因为题目问的是“什么时候去度假”和“到哪里度假”相当于是两个主语，因此这里有两个主语，所以不用第三人称单数，但是”When ane where to go for the holiday“也可以看成是一个主语从句，此时主语为单数，因此也可以选D.

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