when引导的主语从句谓语动词

when and where 引导的主语从句谓语动词用单数还是复数
那如果是表语从句呢?
eg:the guestion ____(is /are) when and where they live

is
如果when和where连在一起用单数,如果分开用复数,例如:
When and where they had the party was unknown.
When they had the party and where they had it were unknown.
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