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is
were
2). 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
当when和where加不定式指的是同一件事时，谓语动词用单数。
总结：一 语法一致：主语复数，谓语复数；主语单数，谓语单数；如果主语是不可数名词，谓语用单数
1。从句、不定式、动名词等做主语时谓语动词视为整体，用单数。
注意：如果主语是两个或者两个以上的名词性从句，谓语用复数。
1.The novelist and poet going to Europe next year.(be)
2.The novelist and the poet going to Europe next year.(be)
is
are
总结2：两个以上的名词组成一个整体概念做主语时，位于用单数
1.The Arabian Nights very interesting.(be)
2.The United States founded in 1776.
is
is
总结3：专用名词如：书名，戏剧名，报刊名，国家（组织名），用单数
1）.Ten thousand dollars ______ quite a large sum.
A. are B. is C.has D. have
2.Ten minutes enough(be)
3.Twenty years passed since he left.(have)
is
has
总结4：表示时间、距离、金额、度量等词语做主语时，视为整体用单数
1）.Six times seven ______ forty-two.
A. are B. is C. have D. was
2）10 plus30 40.