第一个句子时态是一般现在时,表示“备考数学考试”这个事实.
第二个句子时态是现在进行时,表示“正在备考数学考试”,正在进行的动作.
第三个句子时态是一般过去式,表示“曾经备考过数学考试”,是已经完成的动作.
请区分解释下列句子I study for the math test.I am studying for the mat
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