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"I do care about my grades" 就是 "我的确很在意我的成绩"的英文表达。其中 "care" 在这里的意思是 "关心，在意"，而 "about" 是指 "关于"。
例句：
I really care about my grades, so I study hard every day. (我真的很在意我的成绩，所以我每天都努力学习。)
He said that he didn't care about his grades, but I could tell he was lying. (他说他不在意他的成绩，但我知道他在说谎。)
I can't believe you don't care about your grades at all. (我不能相信你根本不在意你的成绩。)
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