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主谓一致1.When and where this took place ( )still unknown.A has

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主谓一致
1.When and where this took place ( )still unknown.
A has B is C were D are
2..What caused the accident and who was respondsible for it ( ) a mysteyy to us .
A has been remained B have been remained
C remain D remains
1. B 主语从句视为单数,排除C、D.unknown, 形容词,系表结构,表示状态.排除A.
2. D what caused the accident and who was reponsible for it 并列主语从句表示一个概念,用单数.remain是系动词,没有被动语态.排除A、B.
明白了吗?
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