讲解It suddenly dawned on me that this express was not roaring down the line at ninetyIt suddenly dawned on me that this express was not roaring down the line at ninety miles an hour,but barely chugging along at thirty.it是形主吗 定从吗 后半句具体都是什么成分 英语
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【答案】 主语从句 that this express was not roaring down the line at ninety miles an hour,but barely chugging along at thirty.是主语,因太长了,用it代