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英语
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I thought it is important to prevent H1N1 and protect environment这句话中第一个is该用原形还是过去式
人气：227 ℃ 时间：2020-05-24 08:50:41
解答
这里 it is important to prevent H1N1 and protect environment 只是描述自己的希望 不是固定定理 根据thought 用过去时was
但是如果后面说的是永恒不变的什么物理定理定律啊 应该用现在时is
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