Its urprised us that he didn't pass the math exam because he does well in math为什么前面是过去时,后边是一般现在时

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Its urprised us that he didn't pass the math exam because he does well in math
为什么前面是过去时,后边是一般现在时

前面表示他在过去发生的动作,后面表示他一直所处的状态或者特性.