It is still (know) ______ whether there will be a war between these two countries.

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问题 It is still (know) ______ whether there will be a war between these two countries.

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答案unknown

解析 注意本题考查了两个知识点:①根据句子结构,此处需要一个形容词做表语,know 的形容词形式为 known;②根据句意,这里应使用known的反义词unknown,意为“未知的,不知道的”。
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