5. when and where to build the new factory______ yet.
a. is not decided b. are not decided
c. has not decided d. have not decided
答：a。从句、不定式、动名词做主语时，谓语动词常用单数形式，如where we’ll hold the meeting has not been decided yet。虽然是两个疑问词并列，但指开会这一件事，故用单数谓浯。若指两件事时，谓语应用复数。如what he did and what he said were different.。他所做的和他所说的是不一致的。从句做主语时，谓语一般用单数形式，但当what从句做主语时应根据其意思来决定。如：
what we need are some engineers. 我们需要的是一些工程师。
what we need is an english interpreter. 我们需要一位英语翻译。
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